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]: The energy that is stored in food originally comes from  
 (A) air (B) soil (C) sunlight (D) water
[A]: C


[Q]: The Piedmont and Coastal Plains regions in Maryland produce crops such as corn, soybeans, wheat, tobacco, tomatoes, and apples. Which environmental factor most likely influences which crops are grown in these regions?  
 (A) soil quality (B) wind speeds (C) bird migration (D) water temperature
[A]: A


[Q]: Which of the following best explains what will occur when a population grows larger than the carrying capacity of its environment?  
 (A) The emigration rate will decrease. (B) The competition rate will decrease. (C) The birth rate will increase. (D) The death rate will increase.
[A]:
D