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.

Example Input: Which of these has the greatest capacity for storing thermal energy from the Sun?  
 (A) air (B) land (C) oceans (D) plants
Example Output: C

Example Input: A wetland habitat can continue to support the birds and fish that live there if people ___.  
 (A) drain the water away (B) flood the highest parts of the land (C) leave the land alone (D) use the land for planting crops
Example Output: C

Example Input: A town in northern Arkansas experienced colder than normal temperatures during part of the winter. Which change was most likely responsible for this?  
 (A) A southward dip in the jet stream (B) A northward movement of the jet stream (C) The Coriolis effect creating a low pressure area (D) The Coriolis effect creating a high pressure area
Example Output:
A