Multi-choice problem: Choose from the options at the end, and answer how do you do this: When making a concrete countertop, how do I prop the countertop so I can get your fingers under it and make it easier to grind the edges?

Choices: A. Lay down strips of popcorn on the ground and lay the countertop right side up on top of them. B. Lay down strips of styrofoam on the ground and lay the countertop right side up on top of them.
B.