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.

Example Input: When a person speaks, the type of wave produced can be described as all these except  
 (A) transverse. (B) mechanical. (C) compression. (D) longitudinal.
Example Output: A

Example Input: A meteoroid becomes a meteorite when it  
 (A) impacts the surface of a planet. (B) encounters the atmosphere of a planet. (C) makes a complete orbit around a planet. (D) starts to burn up in the atmosphere of a planet.
Example Output: A

Example Input: A mountain range has hills around its edges. How are the mountains and hills alike?  
 (A) Both have grass at the top. (B) Both are at least 1000 meters tall. (C) Both have liquid rock at their centers. (D) Both are taller than the land around them.
Example Output:
D