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.

[Q]: Which is considered a property of soil?  
 (A) streak (B) fracture (C) texture (D) luster
[A]: C


[Q]: Auroras occur where Earth's magnetosphere traps high-energy particles in which region of the atmosphere?  
 (A) troposphere (B) stratosphere (C) thermosphere (D) exosphere
[A]: C


[Q]: A student places a chemical in an insulated container and measures the temperature. A second chemical is added and the container is sealed and the temperature is monitored. What is the student trying to determine?  
 (A) What color changes can be observed? (B) How much precipitate is formed? (C) Is heat absorbed or released? (D) How can this reaction be reversed?
[A]:
C