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: Which of the following is closest to the percentage of the total water on earth that is freshwater?  
 (A) 100% (B) 90% (C) 70% (D) 3%

SOLUTION: D

PROBLEM: Which unit is used to indicate the amount of energy in food?  
 (A) ounce (B) degree (C) calorie (D) gram

SOLUTION: C

PROBLEM: The Theory of Plate Tectonics revolutionized scientific thought because it  
 (A) explained the movement of oceanic and continental crusts. (B) demonstrated how tidal forces affect coastlines. (C) mapped the pattern and frequency of earthquakes. (D) explained the mineral differences between continents.

SOLUTION:
A