You are given a science question (easy-level) and four answer options (associated with "A", "B", "C", "D"). Your task is to find the correct answer based on scientific facts, knowledge, and reasoning. Do not generate anything else apart from one of the following characters: 'A', 'B, 'C', 'D'. There is only one correct answer for each question.

[EX Q]: The phases of the Moon are daily changes in the appearance of the Moon. One reason Moon phases occur is because the Moon reflects sunlight. Which is another reason that the phases of the Moon occur?  
 (A) Earth is tilted on the axis. (B) The Moon rises and sets. (C) The Moon orbits Earth. (D) Earth orbits the Sun.
[EX A]: C

[EX Q]: Which form of energy is found in food?  
 (A) chemical (B) electrical (C) sound (D) mechanical
[EX A]: A

[EX Q]: Which is an example of substances reacting chemically?  
 (A) iron and oxygen forming rust (B) paper being cut into small pieces (C) chocolate melting in a pan (D) flour and sugar mixed together in a bowl
[EX A]:
A