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 Input:
Which of these warms most of the air, water, and land on Earth?  
 (A) Coal (B) Electricity (C) Sunlight (D) Wind

Ex Output:
C


Ex Input:
Some birds fly south in the fall and return in the spring. This is an example of  
 (A) migration (B) camouflage (C) hibernation (D) growth

Ex Output:
A


Ex Input:
An atom has a mass of 24 and a nuclear charge of 12. Which statement about the atom is accurate?  
 (A) It has twice as many protons as electrons. (B) It has twice as many neutrons as protons. (C) It has equal numbers of neutrons and protons. (D) It has equal numbers of nuclear particles and electrons.

Ex Output:

C