Correct Answer:
Option A - In the above sentence the underlined word 'why' is an 'Adverb'. Because here 'why' is the interrogative adverb of reason, used to ask a reason about something. Hence, the correct answer is option (a).
A. In the above sentence the underlined word 'why' is an 'Adverb'. Because here 'why' is the interrogative adverb of reason, used to ask a reason about something. Hence, the correct answer is option (a).