Finish the following sentence with the best choice: How do you keep the heat from a fire inside a primitive shelter?

Choices:
- Build a stone wall behind the fire so that the exposed side of the fire is still facing you, this will reflect the heat back into the shelter.
- Dig a hole in the middle of your shelter so that the heat will rise and keep the heat in the shelter instead of drifting into the wind.

Answer:
Build a stone wall behind the fire so that the exposed side of the fire is still facing you, this will reflect the heat back into the shelter.