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.

Example Input: Which tool is best used to collect information about the weather?
(A) ruler (B) stopwatch (C) thermometer (D) collecting net
Example Output: C

Example Input: Sharpening a pencil and tearing paper are examples of physical changes. Which statement describes why these are physical changes?
(A) There is a change in how the objects are used. (B) There is a change in the appearance of the objects. (C) There is a change in the materials from which the objects are made. (D) There is a change in both the appearance of the objects and the materials from which they are made.
Example Output: B

Example Input: Which of these best describes a tornado?
(A) A winter storm that produces frozen precipitation (B) A rotating funnel-shaped cloud with strong winds and thunderstorms (C) A severe weather condition with low temperatures and blowing snow (D) A storm that forms over warm ocean water and has extremely strong winds
Example Output:
B