Pronoun : - any of a small set of words (such as I, she, he, you, it, we, or they) in a language that are used as substitutes for nouns or noun phrases and whose referents are named or understood in the context.

Relative Pronoun: - are words that add information about a noun or tell the relationship between different things. A relative pronoun is a word, such as : who, whom, that or which that is used to introduce a relative clause. These words are called relative pronouns. The compounds whoever, whomever and whichever are also relative pronouns.

In other words, A pronoun which is used to begin a subordinate clause can be referred to as a relative pronoun, since it indicates the relationship of thee subordinate clause to the rest of the sentence. A subordinate clause which is introduced by a relative pronoun is often referred to as a relative clause .

Example : - Paneer pasanda , which we eat at least twice a week, is one of my family's favorite meals. Here , which is a relative pronoun as it is used in a non-defining clause that refers to a person, animal or thing .

In the question : -

The person ________ stayed with me last night was my best friend. In this sentence , who is the correct relative pronoun as it refers to a person .

Thus , the Correct Option is D , which is who.

Pronoun : - Pronouns are words that take the place of nouns. We often use them to avoid repeating the nouns that they refer to. Examples are 'it', 'she', 'something', and 'myself'. '

Relative Pronoun: - are words that add information about a noun or tell the relationship between different things. A relative pronoun is a word, such as : who, whom, that or which that is used to introduce a relative clause. These words are called relative pronouns. The compounds whoever, whomever and whichever are also relative pronouns.

In other words, A pronoun which is used to begin a subordinate clause can be referred to as a relative pronoun, since it indicates the relationship of thee subordinate clause to the rest of the sentence. A subordinate clause which is introduced by a relative pronoun is often referred to as a relative clause .

Example : - The door, which is dark blue, is very tight. Here , which is a relative pronoun as it is used in a non-defining clause that refers to a person, animal or thing .

In the question : -

_____________ books we're scattered on the desk? 

Here , whose is the correct relative pronoun as it is used to refers to a person .

Thus , the Correct Option is A , which is whose .

Pronoun : - A pronoun is a word that you use to refer to someone or something when you do not need to use a noun, often because the person or thing has been mentioned earlier. Examples are 'it', 'she', 'something', and 'myself'. '

Relative Pronoun: - are words that add information about a noun or tell the relationship between different things. A relative pronoun is a word, such as : who, whom, that or which that is used to introduce a relative clause. These words are called relative pronouns. The compounds whoever, whomever and whichever are also relative pronouns.

In other words, A pronoun which is used to begin a subordinate clause can be referred to as a relative pronoun, since it indicates the relationship of thee subordinate clause to the rest of the sentence. A subordinate clause which is introduced by a relative pronoun is often referred to as a relative clause.

Example : - The woman, who is wearing red saree, is a doctor. Here , who is a relative pronoun as it is used to refer to people in the sentence.

In the question : -

1. The students like their English teacher, who is from Bangalore. In this sentence , who is the correct relative pronoun as it is used to refer to people .

2. Have you played the bottle game that is liked by all? In this sentence , that is the correct relative pronoun as it is used in a defining clause that refers to a person, animal or thing .

Thus , the Correct Option is B , which is who , that .