Identify the part of speech of the highlighted word in the following sentence.
We are keen to go on a vacation.

Correct option is D

The correct answer is (d) Adjective.
• The highlighted word “keen” describes the subject “we” by telling the quality/feeling (eager/interested).
• A word that describes a noun or pronoun is called an adjective.
• Here, “keen” shows the state of mind/feeling of “we”, so it functions as an adjective.
Example:
She is keen to learn English.
Why other options are incorrect:
• Noun: a naming word (person/place/thing/idea), but “keen” is not a naming word.
• Pronoun: replaces a noun (he, she, they), but “keen” does not replace anything.
• Verb: shows action, but “keen” is not an action word.