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:
Which of the following is the main role of flowers found on most flowering plants?
(A) to take in air (B) to produce seeds (C) to absorb nutrients (D) to protect the stem

Ex Output:
B

Ex Input:
Florida has a large supply of phosphate that ancient seas deposited millions of years ago. The phosphate contains the remains of animals that were deposited in layers on the sea floor. Which type of rock did the phosphate become?
(A) intrusive igneous (B) extrusive igneous (C) clastic sedimentary (D) organic sedimentary

Ex Output:
D

Ex Input:
What part of a plant needs sunlight to do its job?
(A) stem (B) root (C) leaf (D) flower

Ex Output:
C