instruction:
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.
question:
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%
answer:
D


question:
Most of the United States is a part of which tectonic plate?  
 (A) Pacific Plate (B) Eurasian Plate (C) North American Plate (D) South American Plate
answer:
C


question:
Which cell function is most directly dependent on the cytoskeleton?  
 (A) transport of material inside the cell (B) response of the cell to external pathogens (C) storage of energy in stable long-term forms (D) direction of cellular activity
answer:

A