Directions: In the following question, a sentence has been divided into three parts labelled (A), (B) and (C). Select the part having an error. If there is no error, then mark (D) as your answer.

Chemistry is his favourite (A)/ subject as it is interesting, (B)/ challenging and excites him. (C)/ No error (D)

This is the correct option as this part of the sentence has the error. This sentence violates the rule of parallelism that demands consistency in a sentence’s structure. Any ideas, places, activities etc. must be written in the same grammatical form. Thus, the correct sentence will be, ”Chemistry is his favourite subject as it is interesting, challenging and exciting”.