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: The ounce, the pound, and the ton are units of  
 (A) time. (B) weight. (C) length. (D) distance.

SOLUTION: B

PROBLEM: Jeannie put her soccer ball on the ground on the side of a hill. What force acted on the soccer ball to make it roll down the hill?  
 (A) gravity (B) electricity (C) friction (D) magnetism

SOLUTION: A

PROBLEM: Which statement best explains the reason that electrical wires are made of copper?  
 (A) Copper is strong. (B) Copper is flexible. (C) Copper is a conductor. (D) Copper is an insulator.

SOLUTION:
C