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: Early scientists most likely saw a discharge of electricity for the first time when observing a  
 (A) waterfall (B) rainbow (C) lightning storm (D) volcano erupting
Example Output: C

Example Input: One type of animal hatches from an egg, breathes through gills when it is young, and mainly lives on land as an adult. Into which group is this animal classified?  
 (A) amphibians (B) birds (C) mammals (D) reptiles
Example Output: A

Example Input: Air pollution can influence a person's quality of life. Which best identifies the influence of air pollution?  
 (A) It is a behavioral influence. (B) It is a genetic influence. (C) It is an environmental influence. (D) It is a dietary influence.
Example Output:
C