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.

Input: Consider Input: What happens to the water vapor in an air mass as it ascends?  
 (A) It freezes. (B) It condenses. (C) It vaporizes. (D) It polarizes.

Output: B


Input: Consider Input: Marta studied different forms of energy. Which two types of energy travel in waves?  
 (A) light and sound (B) electrical and sound (C) chemical and light (D) chemical and electrical

Output: A


Input: Consider Input: During a rainstorm, leaves wash down a gully on a hillside. The water slows down at the foot of the hill and fans out, depositing the leaves. What geologic structure is formed in a similar way?  
 (A) a basalt column (B) a stalactite (C) a fault line (D) a delta


Output: D