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 could be a possible way to prevent wildlife species from becoming endangered?
(A) drinking less water (B) establishing more habitats (C) cutting down more forests (D) stopping underground coal mining

Ex Output:
B

Ex Input:
A teacher breaks a bar of pure copper into two different sized pieces. Which is the most likely difference between the two pieces?
(A) mass (B) texture (C) boiling point (D) melting point

Ex Output:
A

Ex Input:
If a scientist wants the medical community to revise old information and use new research findings in the treatment of a disease, it would be best to present the information
(A) at a school science fair. (B) in a newspaper article. (C) at a physicians' conference. (D) in a television commercial.

Ex Output:
C