instruction:
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.
question:
Marta studied different forms of energy. Which two types of energy travel in waves?  
 (A) light and sound (B) electrical and sound (C) chemical and light (D) chemical and electrical
answer:
A


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
answer:
C


question:
Which of these does the MOST harm to the air?  
 (A) Chopping down trees with an ax in the backyard (B) Collecting fall leaves (C) Cutting grass with a gas-powered lawnmower (D) Picking colorful wildflowers along the highway
answer:

C