From what I understand, a law is a specific statement which is assumed by experiment to be correct, whereas a theory is an entire body of knowledge regarding a specific topic, ie the law of conservation of energy is a specific fact assumed through observation but the theory of evolution is an entire body of knowledge regarding the behavior of life.
This answer could be cellular respiration. It makes energy so they can live (in basic terms) haha
The correct answer would be A
It was never the elicit come in the stimulant