instruction:
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.
question:
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.
answer:
B


question:
Which material is the best conductor of electricity?  
 (A) Wood (B) Metal (C) Stone (D) Plastic
answer:
B


question:
Plants that have stems that store water and no leaves would most likely live in a  
 (A) pine forest. (B) grassland. (C) desert. (D) rainforest.
answer:

C