Given the task definition, example input & output, solve the new input case.
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: Which event can cause a large rock to become soil over time?
(A) decaying (B) an earthquake (C) a landslide (D) weathering
Output: D
Under the action of heat, cold, rain, wind, and other atmospheric factors, the rock breaks down physically into small fragments that become the parent material of the soil. Also, atmospheric factors change according to weather.

New input case for you: Logging companies cut trees in a forest and send the trees to lumber mills far from the forest. The mills make boards that are used for construction. Some logging companies do not plant tree seedlings after cutting trees. Not planting tree seedlings might affect people who need boards in the future because
(A) the price of boards will increase (B) the price of boards will decrease (C) there will be more boards available (D) there will be more trees for logging
Output:
A