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:
Large amounts of industrial gases are released into the atmosphere every day. What happens to those gases?  
 (A) They are broken down by ultraviolet light from the Sun. (B) They are converted into nitrogen and oxygen. (C) They rise through the atmosphere and go into outer space. (D) They remain in the atmosphere for long periods of time.

Ex Output:
D


Ex Input:
Many types of organisms live in a meadow. With the introduction of a large, swift-moving predator into the meadow ecosystem, which group of organisms will MOST likely have an advantage of surviving and reproducing?  
 (A) mice that have the thickest fur (B) foxes that have the largest ears (C) gophers that dig the deepest holes (D) rabbits that can run the fastest

Ex Output:
D


Ex Input:
Which event is the best example of competition between species in a pond environment?  
 (A) dragonflies landing on lily pads (B) frogs and toads eating flies (C) lizards and snakes lying in the sun (D) hawks eating mice

Ex Output:

B