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 conducts an investigation using mold spores. In one part of the investigation, he needs to closely examine a spore sample. Which piece of equipment does the student need to use to keep mold spores from entering his respiratory system?  
 (A) breathing mask (B) safety goggles (C) rubber gloves (D) lead smock
A

Which of these best describes wind energy?  
 (A) limited (B) renewable (C) damaging (D) inexpensive
B

As seen from Earth, the appearance of the Moon changes throughout the month. What causes the appearance of the Moon to change?  
 (A) Earth rotating on its axis (B) the Moon rotating on its axis (C) Earth revolving around the Sun (D) the Moon revolving around Earth

D