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:
Because copper is a metal, it is
(A) liquid at room temperature (B) nonreactive with other substances (C) a poor conductor of electricity (D) a good conductor of heat
answer:
D

question:
Melting, boiling, and freezing are examples of
(A) physical changes. (B) chemical changes. (C) magnetic changes. (D) electrical changes.
answer:
A

question:
Some plants rely on hummingbirds for pollination. If a deadly disease infected the hummingbird population, what would most likely happen to the plants?
(A) They would die within hours. (B) They would become endangered. (C) They would need to migrate. (D) They would grow at a slower rate.
answer:
B