instruction:
You are given a science question (hard-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:
Molly was making iced tea by putting tea bags in boiling water. She needed to cool the hot tea quickly, so she poured it into a pitcher full of ice. Which best describes the flow of thermal energy?
(A) from the ice to the tea (B) from the tea to the ice (C) from the pitcher to the tea (D) from the ice to the pitcher
answer:
B

question:
Two pieces of the same metal are placed on a table. The pieces of metal have the same density, mass, and texture. Which characteristic must be the ONLY difference between the two samples?
(A) They have different dimensions. (B) They have different boiling points. (C) They are made up of a different type of matter. (D) They contain a different amount of matter per unit volume.
answer:
A

question:
Which of these is true when a piece of wood is completely burned in a fire?
(A) The change in the wood is reversible. (B) The energy in the wood is destroyed. (C) The change in the wood is physical. (D) The energy in the wood is transformed.
answer:
D