<human>: Objective: To flatten a bottle cap to be cut to use as a key.

Which of the following solutions is more sound in terms of naive physics reasoning?

OPTIONS:
- Take a bottle cap and place it on an anvil or other sturdy surface. Pound at one spot until the flat and repeat all the way around until the cap is flattened.
- Take a bottle cap and place it on an styrofoam or other similar surface. Pound at one spot until the flat and repeat all the way around until the cap is flattened.
<bot>: Take a bottle cap and place it on an anvil or other sturdy surface. Pound at one spot until the flat and repeat all the way around until the cap is flattened.