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: What happens when water flows over a rock for a long period of time?  
 (A) erosion (B) flooding (C) breakage (D) evaporation

SOLUTION: A

PROBLEM: Which two behaviors best demonstrate stewardship?  
 (A) reducing consumption, recycling wastes (B) increasing consumption, discarding wastes (C) reducing consumption, discarding wastes (D) increasing consumption, recycling wastes

SOLUTION: A

PROBLEM: How does a student best avoid becoming dehydrated during a field investigation on a hot day?  
 (A) drink water from a bottle (B) wear a wide-brimmed hat (C) drink a lot before leaving school (D) drink from a clear running stream

SOLUTION:
A