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]: When pressure is released along a fault line, the energy produced spreads as mechanical waves in the form of an earthquake. The mechanical waves transferred to the air become  
 (A) sound. (B) electricity. (C) light. (D) heat.
[EX A]: A

[EX Q]: Which process in the water cycle returns water from the surface of Earth to the atmosphere?  
 (A) condensation (B) evaporation (C) precipitation (D) runoff
[EX A]: B

[EX Q]: More sulfur dioxide is being added to the atmosphere. How will this most likely affect the hydrosphere?  
 (A) There will be a decrease in sea level. (B) The acidity of the ocean will increase. (C) There will be an increase in fresh water. (D) The temperature of the oceans will decline.
[EX A]:
B