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.

A student is asked to bring something that feels rough to class. Which would be BEST for him to bring?  
 (A) Pillow (B) Marble (C) Sandpaper (D) Trading card
C

Which of the following forms of energy is released or absorbed in most chemical reactions?      
 (A) light energy (B) electrical energy (C) sound energy (D) heat energy
D

What characteristic helps a rabbit survive in a winter environment?  
 (A) size (B) strength (C) long ears (D) camouflage

D