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: Historically, how has the compass been used?  
 (A) for navigation (B) to predict weather (C) to measure temperature (D) for mineral identification

SOLUTION: A

PROBLEM: When a cup of water at room temperature is put in a freezer, the water's state of matter will change from  
 (A) liquid to gas (B) gas to liquid (C) liquid to solid (D) solid to liquid

SOLUTION: C

PROBLEM: A dog rolls over and receives a treat. The dog rolls over again. This is an example of  
 (A) learned behavior. (B) adaptive behavior. (C) inherited behavior. (D) instinctive behavior.

SOLUTION:
A