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]: Which best explains how nutrients get into soil?  
 (A) through exposure to air (B) by absorbing sunlight (C) through decaying matter (D) by rocks eroding
[A]: C


[Q]: A student is investigating which type of soil is best for growing tomato plants from seeds. The student plants four tomato seeds in each of three different containers of soil. Which step of the procedure would help the student get the most reliable results?  
 (A) Place one container in a dark room. (B) Use different types of tomato seeds. (C) Change only the soil type in each container. (D) Water each container with a different amount of water.
[A]: C


[Q]: Deforestation in the rainforest can lead to localized extinctions of populations of some organisms. Once an area is deforested, which is most likely to decrease and result in organisms' extinctions?  
 (A) the amount of annual rainfall (B) competition between consumers (C) the energy available to producers (D) diversity of the resources in the habitat
[A]:
D