
Given those answer options, answer the question: You are presented with the quiz "What do mammals have that help maintain temperature?"   But you don't know the answer, so you turn to your teacher to ask for hints. He says that "mammals have a layer of fat under the skin to help insulate the body" and "when stored in the body, fat helps maintain body temperature by acting as an insulator".   So, what's the best answer to the question?
A:
Fat