Finish the following sentence with the best choice: What can I put in the bottom of a flower bed to hold moisture in?

Choices:
- Cut up an old shower curtain or use a trash bag to place in the flower bed before putting soil in.
- Cut up an old porous laundry bag or use a trash bag to place in the flower bed before putting soil in.

Answer:
Cut up an old shower curtain or use a trash bag to place in the flower bed before putting soil in.