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: If a student playing the drums hits the drums with greater force, the sound would be  
 (A) quieter. (B) louder. (C) lower in pitch. (D) higher in pitch.

Answer: B


Question: Which of the following is the most likely cause of earthquakes?  
 (A) shifting rock layers (B) crashing meteorites (C) rotation of the core (D) magnetic force

Answer: A


Question: Roger visited his grandfather who lives on a farm. While he was there, he helped his grandfather move hay out of the barn. As Roger worked in the barn he began sneezing. Which system of the body most likely caused Roger to sneeze?  
 (A) circulatory (B) excretory (C) digestive (D) immune

Answer:
D