Which sentence correctly shows how the apostrophe is used to form a contraction?

The missing notebook contained all of my mom's important passwords.

The storm's arrival on Friday afternoon is really going to mess up my weekend plans.

Jayden's options for electives courses are art, computer science, or Spanish.

Kennedy said it's a great time to buy pool floats because they are all on sale.

Kennedy said it's a great time to buy pool floats because they are all on sale.

The sentence "Kennedy said it's a great time to buy pool floats because they are all on sale" correctly shows how the apostrophe is used to form a contraction.

The sentence that correctly shows how the apostrophe is used to form a contraction is: "Kennedy said it's a great time to buy pool floats because they are all on sale."