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.
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Question: Bones support the body. What pulls and pushes on bones to move them?  
 (A) blood (B) nerves (C) muscles (D) skin

Answer: C


Question: Which is the best example of evaporation?  
 (A) raindrops freezing (B) an ice cube melting (C) a puddle drying in the sun (D) a sponge soaking up water

Answer: C


Question: A student practicing for the outdoor track team begins to sweat. To what stimulus is the body responding?  
 (A) an increase in heart rate (B) an increase in body temperature (C) an increase in oxygen demand (D) an increase in breathing rate

Answer:
B