In which one of the following sentences is the apostrophe used correctly?
a. it's up to you to decide what to do.
b. i put the letter back into it's file.
c. the cat licked it's paws while the dog watched.
d. the train began it's journey across country.

Respuesta :

A.
It's up to you to decide what to do.

In this sentence, it's stands for a contraction for it is.