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 type of organism is the best at fixing nitrogen?  
 (A) bacteria (B) fungi (C) protists (D) animals

Ex Output:
A


Ex Input:
Strong winds have the ability to uproot large trees in a wooded area. Which of these organisms would most likely benefit from this change in a habitat?  
 (A) a bee colony that needs a hive (B) a bird that needs to build a nest (C) a squirrel that needs to find shelter (D) a plant that needs sunlight to grow

Ex Output:
D


Ex Input:
As the amount of carbon dioxide in the atmosphere increases, which occurrence is most likely a long-term result?  
 (A) The polar ice caps will melt. (B) Volcanoes will erupt more often. (C) The number of earthquakes will decrease. (D) Rainforests will be unable to support animal life.

Ex Output:

A