TASK DEFINITION: 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.
PROBLEM: As Earth revolves around the Sun, the number of daylight hours varies from place to place. In which location would the number of daylight hours remain constant?  
 (A) North Pole (B) Prime Meridian (C) Equator (D) Antarctica

SOLUTION: C

PROBLEM: Which organ is made mostly of muscle?  
 (A) heart (B) lung (C) ear (D) brain

SOLUTION: A

PROBLEM: What can cause a moving object to increase its speed in a forward direction?  
 (A) a force pushing on the object from the opposite direction (B) a force that continually acts on the object in the direction the object is moving (C) an increase in the mass of the object (D) a decrease in the mass of the object

SOLUTION:
B