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]: In Maryland, most bears have thick, dark fur. Which statement best explains how dark fur helps bears survive in the forests of Maryland?  
 (A) Dark fur is lightweight. (B) Dark fur scares enemies. (C) Dark fur helps bears hide. (D) Dark fur keeps bears cool.
[A]: C


[Q]: Which particle type can be identified as being from a specific element?  
 (A) electron (B) atom (C) neutron (D) proton
[A]: B


[Q]: Which is not a significant reason why people are living longer today than 100 years ago?  
 (A) development of sugar substitutes (B) development of medicines (C) better health care (D) better nutrition
[A]:
A