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.

Input: Consider Input: 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

Output: A


Input: Consider Input: Which system of the human body provides protection to most of the major organs?  
 (A) skeletal system (B) circulatory system (C) respiratory system (D) muscular system

Output: A


Input: Consider Input: The life cycle of some plants includes the process of pollination. Pollination is helped by  
 (A) wind, water, and insects. (B) sun, water, and roots. (C) humans, sun, and stems. (D) roots, wind, and stems.


Output: A