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.

Ex Input:
When a person speaks, the type of wave produced can be described as all these except
(A) transverse. (B) mechanical. (C) compression. (D) longitudinal.

Ex Output:
A

Ex Input:
Typically, sedimentary rocks are formed
(A) only in erupting volcanoes. (B) only under great pressure and high temperatures. (C) below Earth's surface as magma cools and crystallizes. (D) from materials that settle.

Ex Output:
D

Ex Input:
Squirrels in cold climates gather and store food for winter. The squirrels sometimes bury nuts and then do not return for them. These nuts can grow to become trees. This chain of events is an example of
(A) predation (B) seed distribution (C) competition (D) seed fossilization

Ex Output:
B