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:
Solar radiation provides more heat near the equator than near the poles on Earth. The greatest amount of heat is moved away from the equator by  
 (A) ocean currents. (B) aquatic plants. (C) surface winds. (D) tectonic plates.

Ex Output:
A


Ex Input:
Some plant species are more tolerant of acidic soil than others. The tolerant species are favored in areas affected by which consequence of human activity?  
 (A) mixing of pollutants with rain (B) erosion of topsoil by clearcutting (C) runoff of fertilizer used in farming (D) thinning of the atmospheric ozone layer

Ex Output:
A


Ex Input:
One rabbit runs faster than other rabbits in its population. How will the ability to run fast most likely benefit the rabbit?  
 (A) by keeping the rabbit warmer in the winter (B) by helping the rabbit blend with its environment (C) by allowing the rabbit to find more sources of food (D) by making it easier for the rabbit to escape from predators

Ex Output:

D