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]: 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
[A]: A


[Q]: What change would occur if Earth's rate of rotation significantly increased?  
 (A) The year would be shorter. (B) The year would be longer. (C) The day would be shorter. (D) The day would be longer.
[A]: C


[Q]: Ricardo has an igneous rock in his rock collection. Where did this rock most likely form?  
 (A) in a volcano (B) on a forest floor (C) on a coral reef (D) at the bottom of a river
[A]:
A