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:
A pot is heated on a stove. Which process causes the metal handle of the pot to also become hot?
(A) combustion (B) convection (C) radiation (D) conduction
answer:
D

question:
A shallow container of salt water is placed in sunlight for a day. Which is the most likely result?
(A) All of the mixture will evaporate. (B) The salt will keep the water from evaporating. (C) The salt will separate from the water and float at the top of the container. (D) Only the water will evaporate and the salt will remain in the container.
answer:
D

question:
A student wraps a wire around an iron nail. The student then connects the wire to a battery. The nail attracts another nail and they stick together. What force holds the two nails together?
(A) gravitational force (B) magnetic force (C) electric force (D) friction force
answer:
B