Question

Fill in the blank with a suitable preposition.
What are you laughing _____________?
A) Of
B) In
C) With
D) For

Answer 1

Hint: A preposition is a term used within a sentence to attach nouns, pronouns, or phrases to other terms. They work to bind a sentence's entities, things, time and locations. Prepositions are commonly short words, and they are usually put in front of nouns directly.

Complete answer:
The speaker asks everyone the explanation for their amusement in the question given. So it is appropriate to use the preposition of justification to complete the same. In the given case, the preposition 'for' is fitting because it conveys that the person is laughing because of something, and there is also a justification for the gesture. Option D is also right.
As laughter is not a substance, source or root of something here, 'Of' would be unsuitable here. Choice A is therefore false. Whereas, as the word 'laughing' is not a geographical location nor is it an entity that you use as an instrument, no one can laugh 'in' anything or 'with' something. Options B and C are also inaccurate.
Hence, the correct answer is (Option D) i.e. for because it justifies the gesture of a person.

Note: In the nutshell, a preposition precedes a verb or a pronoun. Here is a list of prepositions that are widely used: above, around, toward, along, between, across, at, before, above, beyond, below, beside, across, around, under, from, in, through, close, around, across, on, to, within, below, upon, with and within.