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:
Which action does a kitten learn from its mother?  
 (A) how to grow (B) how to meow (C) how to hunt mice (D) how to nurse milk
answer:
C


question:
Two atoms of oxygen combine to form pure oxygen gas. What is the electrical charge of the O_{2} molecules?  
 (A) positive (B) negative (C) neutral (D) variable
answer:
C


question:
When cold weather freezes water in the cracks of rocks, which would most likely happen?  
 (A) The rocks would become rounded. (B) The rocks would be used for shelter. (C) The rocks would be moved by the wind. (D) The rocks would break into smaller pieces.
answer:

D