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:
Solids, liquids, and gases are all different states of which of the following?  
 (A) mass (B) matter (C) weight (D) volume
answer:
B


question:
Which of these best describes wind energy?  
 (A) limited (B) renewable (C) damaging (D) inexpensive
answer:
B


question:
Photosynthesis occurs in which of these organisms?  
 (A) Sunflower plant (B) Mushroom (C) Sunfish (D) Luna moth
answer:

A