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:
If a student playing the drums hits the drums with greater force, the sound would be
(A) quieter. (B) louder. (C) lower in pitch. (D) higher in pitch.

Ex Output:
B

Ex Input:
Gregor Mendel studied ratios related to traits passed from parent pea plants to offspring pea plants. Mendel used large numbers of plants to avoid "sampling error." This changed the way scientists studied genetics because it included ideas of
(A) nuclei and DNA. (B) atoms and molecules. (C) ecology and environment. (D) mathematics and probability.

Ex Output:
D