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: Sharpening a pencil and tearing paper are examples of physical changes. Which statement describes why these are physical changes?
(A) There is a change in how the objects are used. (B) There is a change in the appearance of the objects. (C) There is a change in the materials from which the objects are made. (D) There is a change in both the appearance of the objects and the materials from which they are made.

SOLUTION: B

PROBLEM: 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

SOLUTION: C

PROBLEM: When a switch to a ceiling fan is turned on, electrical energy is being transformed into
(A) atomic energy. (B) potential energy. (C) chemical energy. (D) mechanical energy.

SOLUTION:
D