TASK DEFINITION: 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.
PROBLEM: 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?

SOLUTION: C

PROBLEM: Use of nuclear fuel would most likely reduce human contributions to which environmental problem?  
 (A) ozone thinning (B) landfill creation (C) shoreline erosion (D) greenhouse heating

SOLUTION: D

PROBLEM: A donkey and a horse can be bred to produce a mule. Which observation is evidence that donkeys and horses are two different species?    
 (A) They have different body sizes. (B) A mule is not able to reproduce. (C) They are found in different environments. (D) A mule does not resemble either parent.

SOLUTION:
B