Question

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

Answer 1

The apostrophe is used correctly in 'c'. All the other's use it as 'it's' rather than 'its;

Answer 2

c. Depende de usted decidir qué hacer