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 is a way the agricultural biotechnology industry could have a positive impact on the environment?  
 (A) by producing crops that are virus resistant (B) by making robots to replace large farm machines (C) by reducing the need for countries to import food (D) by increasing the use of wind farms that produce electricity

Ex Output:
C


Ex Input:
In the United States, which is responsible for ensuring the safety of the country's drinking water?  
 (A) Environmental Protection Agency (EPA) (B) Food and Drug Administration (FDA) (C) National Oceanic and Atmospheric Administration (NOAA) (D) Center for Disease Control (CDC)

Ex Output:
A


Ex Input:
Ocean currents, like the Gulf Stream, affect world climate by  
 (A) spreading plant and animal life over a wider area. (B) ensuring ocean density is not the same globally. (C) carrying sediment from rivers and inland basins. (D) transferring heat to and from various regions.

Ex Output:

D