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:
What is the main function of red blood cells?  
 (A) To fight disease in the body (B) To carry oxygen to all parts of the body (C) To remove carbon monoxide from all parts of the body (D) To produce materials which cause the blood to clot.
answer:
B


question:
When pressure is released along a fault line, the energy produced spreads as mechanical waves in the form of an earthquake. The mechanical waves transferred to the air become  
 (A) sound. (B) electricity. (C) light. (D) heat.
answer:
A


question:
What are the properties of the Earth's crust and mantle that are most responsible for Earth's tectonic activity?  
 (A) They are in different states and have different temperatures. (B) They are in the same state but have different temperatures. (C) They are in different states but have the same temperature. (D) They are the same state and have the same temperature.
answer:

A