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]: Which of the following statements best explains why earthquakes occur more frequently in California than in Massachusetts?  
 (A) The rock found in California is igneous, but the rock found in Massachusetts is sedimentary. (B) California is located on the boundary of two crustal plates, but Massachusetts is not. (C) The rock under California is soft, but the rock under Massachusetts is hard. (D) California is located on a continental plate, but Massachusetts is not.
[EX A]: B

[EX Q]: Which energy source is considered nonrenewable?  
 (A) moving water (B) fossil fuel (C) wind (D) biomass
[EX A]: B

[EX Q]: Louis Pasteur discovered a process that allows milk to be stored in sealed containers for long periods of time without spoiling. The process, called pasteurization, involves heating the milk before placing it in the sealed containers.Which is the best explanation of how pasteurization works?   
 (A) Heat strengthens molecules that prevent spoiling. (B) The chemical structure of the food changes with the heat. (C) Heat killed microorganisms that could cause spoiling. (D) The food particles are better mixed after heating.
[EX A]:
C