Fill in the blank with the suitable gerund:
I like _____________ for a walk.

Correct option is A

The correct answer is (a) Going.

I like going for a walk.

In the sentence, "I like _____________ for a walk," the blank requires a gerund (going) to describe the action of walking as an enjoyable activity.
A gerund is the -ing form of a verb that functions as a noun.

• To go: Infinitive form, not a gerund.
• In going: Incorrect prepositional usage.
• On going: Suggests continuity rather than enjoyment of the action.