Paronyms and Homonyms : - Confusion is often caused in understanding the meanings of certain words because they are either similar in meaning and form or similar in their sound of pronunciation.

The words which are different in meaning or use but are similar in form or derivations are called Paronyms.  For example :

Adjacent - Adjoining

Adjacent = laying near.  Eg: They were allowed to write examination.

Adjoining = next .  Eg: The post office adjoins the main road. 

On the other hand Homonyms are similar in their sound pronunciation but different in meaning They are also called Homophones . For example :

Accept - Except

Accept = to receive something. Eg : India ACCEPTED its defeat at the hands of Australia.

Except = to take or leave out . Eg : All the children were given a share in the property EXCEPT  Mohit Sharma.

In the question :

It is very difficult to control a horse without a ___________ .

The word that can be filled in the blank part is Bridle which means reins .

For example : -  It is the bridle and spur that make a good horse .

Other Usage : -  A boisterous horse must have a rough bridle.

Option A : - Bridal : - (of bride) The bridal dress must have cost a lot.

Option C : - Barbaric : - (savage,simple) She was selected to play the part of a village damsel because of her barbaric beauty.

Option D : - Barbarous : - (inhuman) The Muslim invaders were barbarous in their wars.

Thus , the Correct Option is B , which is bridle .

Paronyms and homonyms :  Confusion is often caused in understanding the meanings of certain words because they are either similar in meaning and form or similar in their sound of pronunciation.

The words which are different in meaning or use but are similar in form or derivations are called Paronyms.  For example :

 Imaginary - Imaginative

Imaginary =  unreal. Eg: Modern man is living in imaginary world.
Imaginative = Creative. Eg: John Keats was a great imaginative poet.

On the other hand Homonyms are similar in their sound pronunciation but different in meaning They are also called Homophones . For example :

knight - Night

knight = a man who served his sovereign or lord as a mounted soldier in armour. Eg. : The knight is on his way to the castle .

Night = the period between afternoon and bedtime; an evening. Eg. He was not allowed to go out on weekday nights .

This house is near the _______ of India .  

The word that can be filled in the blank part is border .

For example : - He drove us right up to the Russian border.  

Other Usage : - , Villages along the border are regularly raided. 

Option B : - Boarder :-  a person who forces their way on to a ship in an attack . eg .He was like a boarder , or maybe the visiting brother-in-law you want to kick out but don't know how. 

Option C : -   Berth : - (a seat in a train) I have got two berths booked in the Rajdhani Express.

Option D : - Bail : - (security) His application for release on bail was rejected.

Thus , the Correct option is A  , which is border .

Paronyms and Homonyms : - Confusion is often caused in understanding the meanings of certain words because they are either similar in meaning and form or similar in their sound of pronunciation.

The words which are different in meaning or use but are similar in form or derivations are called Paronyms.  For example :

 Destination - Destiny

Destination = goal. Eg: They reached their destination in the evening.
Destiny = fate. Eg: Nobody can stop destiny.

On the other hand Homonyms are similar in their sound pronunciation but different in meaning They are also called Homophones . For example :

Finnish - Finish

Finnish: relating to the Finns or their language. Eg. Our neighbors who have just moved to the apartment are Finnish.
Finish: end, complete .Eg. I finished the morning swimming race first.

In the question : - 

_________ still prevails in most of the tribal regions of the world . 

The word that can be filled in the blank part is Barbarism  which means uncivilised conditions .

For example : - Gradually the prevailing barbarism was tempered.

Other Usage : - He witnessed some appalling acts of barbarism during the war.

Option B : -  Barbarity : - (cruelty) Hitler's barbarity is to terrible to be related.

Option C: -  Beatitude : - (state of bliss, blessedness) He experienced beatitude before he died.

Option D : - Beatific : - (feeling joy & peace) The saints are always in a beatific state of mind.

Thus , the Correct option is A , which is Barbarism .