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: A student tosses a ball into the air. Which force causes the ball to fall back to the ground?  
 (A) gravity (B) magnetism (C) mechanical (D) friction

SOLUTION: A

PROBLEM: Which of the following best represents one particular stage in a life cycle?  
 (A) a fish swimming (B) a seed sprouting (C) a leaf growing (D) a dog eating

SOLUTION: B

PROBLEM: A class measures the time it takes for two different trucks to drive across the parking lot. How can they tell which truck is faster?  
 (A) The truck that starts moving first is faster. (B) The truck that takes less time is faster. (C) The truck that has bigger tires is faster. (D) The truck that takes more time is faster.

SOLUTION:
B