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]: Sam looks into a fish pond and points at a goldfish. Sam's grandfather looks where Sam is pointing and tells Sam that the fish is actually in a different location. Which property of light explains why Sam's grandfather is correct?  
 (A) reflection (B) refraction (C) diffraction (D) absorption
[EX A]: B

[EX Q]: Which property of air does a barometer measure?  
 (A) speed (B) pressure (C) humidity (D) temperature
[EX A]: B

[EX Q]: During which chemical process is energy absorbed?  
 (A) iron nails rusting (B) candles burning (C) vegetables rotting (D) plants photosynthesizing
[EX A]:
D