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.

Q: Which tool is best used to collect information about the weather?  
 (A) ruler (B) stopwatch (C) thermometer (D) collecting net

A: C
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Q: Because copper is a metal, it is  
 (A) liquid at room temperature (B) nonreactive with other substances (C) a poor conductor of electricity (D) a good conductor of heat

A: D
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Q: Different systems of the human body perform different functions. Which system takes oxygen from the air to be moved by the circulatory system?  
 (A) the respiratory system (B) the digestive system (C) the nervous system (D) the skeletal system

A:
A
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