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 is the best example of something that has kinetic energy?  
 (A) a rock sitting at the top of a steep hill (B) a tennis ball rolling across the court (C) a picture hanging on the wall (D) a piece of wood before it is burned
[A]: B


[Q]: Which of the following helps the body to cool down?  
 (A) shivering (B) sweating (C) running a fever (D) taking deep breaths
[A]: B


[Q]: What is the BEST reason for including fruits and leafy vegetables in a healthy diet?  
 (A) They have a high water content. (B) They are the best source of protein. (C) They are rich in minerals and vitamins. (D) They are the best source of carbohydrates.
[A]:
C