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.

Example Input: A student pushes a box to slide it across the floor. Which statement explains why the box begins to move?  
 (A) The weight of the box is greater than the force of friction. (B) The weight of the box is less than the force of friction. (C) The applied force is greater than the force of friction. (D) The applied force is less than the force of friction.
Example Output: C

Example Input: Some birds fly south in the fall and return in the spring. This is an example of  
 (A) migration (B) camouflage (C) hibernation (D) growth
Example Output: A

Example Input: In the Four Corners area in the US Southwest, there are large rocky outcroppings of basalt. These were formed by ancient lava flows. Using this information, what class of rock is this?  
 (A) metamorphic (B) sedimentary (C) igneous (D) weathered
Example Output:
C