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 unit of measurement describes an object's length?  
 (A) meter (B) kilogram (C) liter (D) degree

SOLUTION: A

PROBLEM: Which of the following allows a cell to become specialized?  
 (A) location of the cell in the body (B) function of the cell in the body (C) different patterns of gene expression (D) different combinations of genes in the nucleus

SOLUTION:
C