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: How does sedimentary rock form?  
 (A) sediments cool (B) sediments melt (C) sediments separate (D) sediments compress
Example Output: D

Example 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
Example Output: B

Example Input: Pouring water over a sloping tray of soil demonstrates how  
 (A) soil can be washed away. (B) soil creation may take years. (C) river sediment forms a delta. (D) planting grass protects the soil.
Example Output:
A