You are given a science question (hard-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:
Sooj learned that whales use vocalization to navigate and to communicate with other whales. Some scientists think that noise pollution in whale habitats may harm whale populations. What would be the most likely effect of noise pollution on whales?  
 (A) alteration of whale genetic material (B) reversed flow of energy through whale habitats (C) reduced populations of food organisms in whale habitats (D) separation of whale family groups

Ex Output:
D


Ex Input:
Farmers in Wyoming were concerned because some of their chickens were being preyed upon by hawks that lived in areas around their ranches. The farmers grouped together and hunted the hawks until they were no longer in their area. Which would most likely happen next?  
 (A) The chicken population would go down. (B) Populations of mice and rats would increase. (C) Another bird of prey would replace the hawk. (D) The chickens would have a lower rate of disease.

Ex Output:
B


Ex Input:
Which is a characteristic of a dog that is most likely a result of its environment?  
 (A) its color (B) its length of ears (C) its food preference (D) its ability to see in the dark

Ex Output:

C