In which one of the following sentences is the apostrophe used correctly?
A. I put the letter back into it's file.
B. The train began it's journey across country.
C. The cat licked it's paws while the dog watched.
D. It's up to you to decide what to do.
♥ D. It's up to you to decide what to do. This is because "it's" is meaning "it is" So if you replace its with it is, you need to find the one that makes the best sense. Final answer: D. It's up to you to decide what to do.
