Q: You are presented with the quiz "Food consists of organic molecules that store heat where?" But you don't know the answer, so you turn to your teacher to ask for hints. He says that "food consists of organic molecules that store energy in their chemical bonds" and "basically, heat is energy". So, what's the best answer to the question?

Options are:
[a]. in their chemical bonds;
[b]. the rest of the body;
[c]. the environment;
[d]. by keeping them warm;
[e]. Earth orbiting the Sun;
[f]. Earth revolving around the sun;
[g]. it helps plants in growing;
[h]. the body's largest organ;
A:
[a].