Identify the part of speech of the highlighted expression.
Students should not while away their time in frivolous activities.

Correct option is B

Correct answer: (b) Verb
Meaning (in detail):
• while away → to spend time in a relaxed/idle way; to pass time (often wastefully) (Hindi: समय बिताना / समय गंवाना)
• In the sentence, “should not while away” shows an action, so it is a verb (phrasal verb).
Example: He whiled away the afternoon watching TV.
Hence, option (b) is the correct answer.