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.

[Q]: Soil will pack down over time which decreases the ability of the soil to hold water. Which animals would best help the soil hold water?
(A) earthworms making tunnels under the surface (B) cattle making depressions with their hooves (C) horses making trenches when they gallop (D) sheep pulling up plants by their roots
[A]: A

[Q]: Which is a fact rather than an opinion about earthquakes?
(A) Earthquakes occur along fault lines. (B) Earthquakes are worse than hurricanes. (C) Earthquakes are bad for all local businesses. (D) Earthquakes always cause major damage to homes.
[A]: A

[Q]: Stretching is considered an important step before engaging in sports. In an investigation to see whether stretching before physical exertion reduces sports injuries, who would the control group most likely be?
(A) athletes who stretch before working out (B) non-athletes who stretch before working out (C) athletes who do not stretch before working out (D) non-athletes who do not stretch before working out
[A]:
C