Subject-verb agreement : - Subject-verb agreement is the grammatical rule that the verb or verbs in a sentence must match the number, person, and gender of the subject; in English, the verb needs to match just the number and sometimes the person . Subject-verb agreement, also called “subject-verb concord,” refers to matching the subject and verb of a sentence in tense, aspect, and mood (abbreviated as TAM), which translates to number, person, and gender.

Plural Subject Plural Verb:  If the subject is plural, the verb must also be plural. There are some special cases.

A) If two or more singular nouns are joined by conjunction 'and' the plural form of verb is used.

• A car and a bike are the two means of transportation.

B)  If we are referring to the members of the unit individually, the plural form of verb is used.

• The cast have been practicing their lines.

In the question : -

1. They ___________ going to the museum .

In this sentence , the subject is they and it is a plural subject so we use were as plural verb .

2. The flock ____________ running off in every direction.

In this sentence , we are referring to the members of the unit individually, the plural form of verb is used so we used were as plural verb .

3. The police ___________ already here.

In this sentence ,  some nouns such as police but plural in meaning the plural form of verb is used so we used were here as plural verb .

Thus , the Correct Option is B , which is 1. Were 2. Were 3. Were .

Subject-verb agreement : - Subject-verb agreement is the grammatical rule that the verb or verbs in a sentence must match the number, person, and gender of the subject; in English, the verb needs to match just the number and sometimes the person . Subject-verb agreement, also called “subject-verb concord,” refers to matching the subject and verb of a sentence in tense, aspect, and mood (abbreviated as TAM), which translates to number, person, and gender.

Plural Subject Plural Verb:  If the subject is plural, the verb must also be plural. There are some special cases.

A) If two or more singular nouns are joined by conjunction 'and' the plural form of verb is used.

• A car and a bike are the two means of transportation.

B)  If we are referring to the members of the unit individually, the plural form of verb is used.

• The cast have been practicing their lines.

In the question : -

1. The rich __________ generally unkind to the food .

In this sentence , the subject the rich sometimes an adjective but it is used as a noun. It is preceded by 'the' which means 'people' . (The rich = people who are rich ). Plural verb is required , so we used plural verb are here .

2. The poor ___________ trustworthy.

In this sentence , the subject the rich sometimes an adjective but it is used as a noun. It is preceded by 'the' which means 'people' . (The poor = people who are poor). Plural verb is required , so we used plural verb are here .

Thus , the Correct Option is A , which is 1. Are 2. Are .

Subject-verb agreement : - Subject-verb agreement is the grammatical rule that the verb or verbs in a sentence must match the number, person, and gender of the subject; in English, the verb needs to match just the number and sometimes the person . Subject-verb agreement, also called “subject-verb concord,” refers to matching the subject and verb of a sentence in tense, aspect, and mood (abbreviated as TAM), which translates to number, person, and gender.

Plural Subject Plural Verb:  If the subject is plural, the verb must also be plural. There are some special cases.

A) If two or more singular nouns are joined by conjunction 'and' the plural form of verb is used.

• A car and a bike are the two means of transportation.

B)  If we are referring to the members of the unit individually, the plural form of verb is used.

• The cast have been practicing their lines.

In the question : -

1. The committee members is divided in their opinion .

The correct form of the above sentence is :

The committee members are divided in their opinion .

In this sentence , we are referring to the members of the unit individually , so plural verb are is used instead of is .

2. The police was nabbed the culprit .

The correct form of the above sentence is :

The police have nabbed the culprit .

In this sentence , the noun the police is used as subject in a singular form but it is plural in meaning and thus take plural verb have instead of was .

Thus , the Correct Option is C , which is 1. The committee members are divided in their opinion . 2. The police have nabbed the culprit .