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:
During which stage of an insect's life cycle does the female lay eggs?
(A) nymph (B) larva (C) pupa (D) adult

Ex Output:
D

Ex Input:
Which statement describes animal embryos?
(A) display all the features of an adult (B) represent the earliest stage of development (C) have the same number of cells as a fertilized egg (D) have half the number of chromosomes as an adult

Ex Output:
B

Ex Input:
Why are most fossils found in sedimentary rocks?
(A) Sedimentary rocks are not very old. (B) Organisms live only in areas with sedimentary rock. (C) Organisms can be preserved in sedimentary rock. (D) Sedimentary rocks are found only at the surface of the ground.

Ex Output:
C