You are given a science question (hard-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.

Example Input: During an investigation, heat transferred from a liquid to the environment. Which pair of explanations can best account for this result?
(A) The temperature of the liquid increased, or the liquid became a gas. (B) The temperature of the liquid increased, or the liquid became a solid. (C) The temperature of the liquid decreased, or the liquid became a gas. (D) The temperature of the liquid decreased, or the liquid became a solid.
Example Output: D

Example Input: Anna's class counted the number of butterflies in the school garden for an assignment. Anna's results were different from the rest of the class. What should she do?
(A) Change the assignment. (B) Leave the results alone. (C) Match her results with the class. (D) Ask the teacher to count for her.
Example Output: B

Example Input: In the geologic past, abiotic factors such as volcanic eruptions have had an impact on the availability of resources. How can volcanic eruptions impact the availability of resources?
(A) by decreasing the thickness of soil (B) by causing more heavy rains to erode topsoil (C) by disrupting the sunlight from reaching producers (D) by causing the surface of Earth to be warmer than usual
Example Output:
C