Finish the following sentence with the best choice: Loosen your hard to use zippers

Choices:
- A zipper that won't move up or down easily can be loosened by applying olive over the zipper.
- A zipper that easily moves up and down can be tightened by grinding down the individual zipper teeth.

Answer:
A zipper that won't move up or down easily can be loosened by applying olive over the zipper.