Question

What is the preposition in this sentence?

Answer 1

Prepositions are words describing where something or someone is located. 'Under' shows that the little sister is hiding somewhere on or off the table. Therefore the answer is C. By the way, you missed the r on your.
I hope I helped.

Answer 2

In this sentence, Under is the correct form of preposition used. All other words like Found is verb in second form, Hiding is also a verb and your is a subject.