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: Which property of air does a barometer measure?  
 (A) speed (B) pressure (C) humidity (D) temperature
Example Output: B

Example Input: A student is dropping objects of various sizes and shapes and recording the time it takes for each object to hit the ground. Which question is the student most likely trying to answer?  
 (A) What force slows some objects down? (B) What force pulls objects to the ground? (C) Do some objects fall more quickly than others? (D) Do objects break or bounce when hitting the ground?
Example Output: C

Example Input: A rock formation in a land area contains fossils. Over time, tremendous heat and pressure change the formation to produce a harder rock formation without fossils. Which change in rock type has occurred in this land area?  
 (A) Igneous rock has turned into sedimentary rock. (B) Igneous rock has turned into metamorphic rock. (C) Sedimentary rock has turned into igneous rock. (D) Sedimentary rock has turned into metamorphic rock.
Example Output:
D