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]: Seismic waves occur as a result of an earthquake. Which statement describes a wave property that makes it possible for scientists to locate the source of an earthquake?  
 (A) The wavelength of a wave is measured from crest to crest. (B) Waves travel uniformly outward from the wave source. (C) The frequency of waves varies in different mediums. (D) Waves move at the same speed in different materials.
[EX A]: B

[EX Q]: When air rises over the open ocean, a low pressure system is formed. Which factor increases the potential of a low pressure system developing into a hurricane in the Northern Hemisphere?  
 (A) cool ocean currents circulating towards the equator (B) increased volcanic activity in the upper latitudes (C) cold air moving south from the North Pole (D) warm water temperatures in the tropics
[EX A]: D

[EX Q]: Cells in the body use oxygen (O2) for cellular respiration. Which is the result of cellular respiration?  
 (A) ATP is produced and carbon dioxide (CO2) is released. (B) ATP is consumed and carbon dioxide (CO2) is released. (C) ATP is produced and carbon dioxide (CO2) is absorbed. (D) ATP is consumed and carbon dioxide (CO2) is absorbed.
[EX A]:
A