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: If you took all of the atoms out of a chair, what would be left?
(A) The chair would still be there, but it would weigh less. (B) The chair would be exactly the same as it was before. (C) There would be nothing left of the chair. (D) Only a pool of liquid would be left on the floor.

SOLUTION: C

PROBLEM: A large number of species on Earth became extinct during a short time period about 65 million years ago. Based on this pattern of extinction, which is the most likely cause?
(A) gradual climate change (B) continued climate stability (C) sudden global climate change (D) gradual ecosystem succession

SOLUTION: C

PROBLEM: Two processes are involved in the formation of a sand dune. Which two processes best describe how a sand dune forms?
(A) wind erosion then deposition (B) plate movement then deposition (C) wind erosion then water erosion (D) water erosion then plate movement

SOLUTION:
A