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]: In the morning, students observed puddles of water all over the playground. What would best explain why the playground was dry in the afternoon?  
 (A) Animals drank the water. (B) The wind stopped blowing. (C) Someone dried the puddles. (D) The water evaporated during the day.
[EX A]: D

[EX Q]: If you took all of the atoms out of a chair, what would be left?  
 (A) The chair would still be there, but it would weigh less. (B) The chair would be exactly the same as it was before. (C) There would be nothing left of the chair. (D) Only a pool of liquid would be left on the floor.
[EX A]: C

[EX Q]: The Theory of Plate Tectonics is based on  
 (A) evidence of sea floor spreading. (B) topographic mapping of mountain ranges. (C) an analysis of soil at the plate boundaries. (D) volcanic activity along coastlines.
[EX A]:
A