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: Shale is a sedimentary rock that can be metamorphosed into slate by  
 (A) cementation. (B) chemical weathering. (C) sedimentation. (D) increased pressure.

SOLUTION: D

PROBLEM: Kim lost her hammer outside. When she found it a few months later, some parts of the metal were covered with flaky, brown rust. Which type of change occurred when rust formed on the hammer?  
 (A) chemical (B) electrical (C) thermal (D) physical

SOLUTION: A

PROBLEM: Which of these has been controlled in an attempt to reduce the depletion of ozone in Earth's atmosphere?  
 (A) methods of filtering gasoline (B) use of chlorofluorocarbons (CFCs) (C) methods of radioactive waste storage (D) use of mercury (Hg) compounds

SOLUTION:
B