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.

[EX Q]: A dish of sugar water was left on a window sill. One week later, there were only sugar crystals left in the dish. The water was gone. The best explanation for the appearance of sugar crystals is  
 (A) some of the water was absorbed by the dish. (B) the air condensed. (C) the light shining on the window sill produced more sugar. (D) the water evaporated.
[EX A]: D

[EX Q]: In what type of rock would a geologist most likely find evidence of ancient life?  
 (A) sedimentary (B) foliated (C) metamorphic (D) volcanic
[EX A]: A

[EX Q]: Tony always drinks water before and after his long bike rides. Why does his body need water when he exercises?  
 (A) Drinking water after exercise allows the body to sleep. (B) Drinking water after exercise helps to replace lost fluids. (C) Drinking water before exercise helps increase the heart rate. (D) Drinking water before exercise prevents the body from sweating.
[EX A]:
B