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 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:
Which is a trait that a child can inherit from its parents?  
 (A) eye color (B) a broken leg (C) length of hair (D) language skills

Ex Output:
A


Ex Input:
Which event would most likely occur if the number of nitrogen fixing bacteria were reduced within an ecosystem?  
 (A) plants would have more nitrates to take up (B) plants and animals would decompose faster (C) high levels of ammonia would accumulate in the soil (D) the level of nitrogen gas in the atmosphere would increase

Ex Output:

D