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 units best represents the density of an object?  
 (A) kg (B) hr (C) m/s^2 (D) g/cm^3
answer:
D


question:
Which property of proteins best allows them to perform an enormously diverse range of functions?  
 (A) their large, chemical-energy reserve (B) their large, stored-electric potential (C) the complexity of their folded structure (D) the wide variety of elements they include
answer:
C


question:
Where are the most reactive nonmetals located on the periodic table?  
 (A) the uppermost complete row of the table (B) the rows at the bottom of the table connecting two sections (C) the column at the far left side of the table (D) the second column from the right side of the table
answer:

D