Available choices: a). honey b). acid rain c). woods d). warmth e). genes f). food g). oxygen h). heat
Given those answer options, answer the question: You are presented with the quiz "What is necessary for the survival of animals?"   But you don't know the answer, so you turn to your teacher to ask for hints. He says that "an animal requires warmth for survival" and "light and heat and warmth are basic necessities for survival".   So, what's the best answer to the question?
A:
h).