In the following question, one part of the sentence may have error. Find out which part of the sentence has an error and click the option corresponding to it. If the sentence is free from error, click the ‘No Error’ option. Danish is one of the notorious kids (A)/ of the class B)/ who are always ready to fight (C)/ No error (D).?

Option 4 : D

The correct answer is Option 4 i.e. 'No error'

In part C of the given sentence, the usage of 'are' is correct because according to the rule of antecedent 'the verb should be according to the antecedent of the relative pronoun.' 
In part C relative pronoun is 'who' and the antecedent is 'the class' which is plural in number hence the verb should be plural i.e. 'are'

• Let's see an example:
  • The teacher who gives out candy is always the students' favorite.

So the correct sentence is:
Danish is one of the notorious kids of the class who are always ready to fight.