Please come in, here "in" Is?
ক
Verb
খ
Preposition
গ
Adverb
ঘ
None of these
সঠিক উত্তর: Adverb
You usually use a noun, noun phrase, pronoun, or a gerund after the "in" when it's used as a preposition, whereas there are usually no such words after the "in" when it's used as an adverb.