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: Some of the new cars being made can run on a renewable fuel that is made mostly from corn. Scientists are developing even more renewable fuels to replace gasoline. Why are renewable fuels most likely becoming more important?  
 (A) Renewable fuels release less energy. (B) Car fuel tanks are being made smaller. (C) The demand for gasoline is decreasing. (D) Nonrenewable fuel supplies are limited.
Example Output: D

Example Input: Many states require vehicles to be examined and to meet safety and pollution standards. What impact might vehicle inspections have on the environment?  
 (A) The environment will not be polluted. (B) The environment will become more polluted. (C) Fewer pollutants will be released by vehicles. (D) Fewer pollutants will be produced by older vehicles.
Example Output: C

Example Input: When white light shines on Peter's shirt, the shirt looks blue. Why does the shirt look blue?  
 (A) It absorbs all the white light and turns most of it into blue light. (B) It reflects the blue part of the light and absorbs most of the rest. (C) It absorbs only the blue part of the light. (D) It gives off its own blue light.
Example Output:
B