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.

Example Input: Which type of organism is at the lowest level of the food chain?  
 (A) autotroph (B) heterotroph (C) carnivore (D) omnivore
Example Output: A

Example Input: When air rises over the open ocean, a low pressure system is formed. Which factor increases the potential of a low pressure system developing into a hurricane in the Northern Hemisphere?  
 (A) cool ocean currents circulating towards the equator (B) increased volcanic activity in the upper latitudes (C) cold air moving south from the North Pole (D) warm water temperatures in the tropics
Example Output: D

Example Input: Old, worn-out rubber tires are called scrap tires. Which way of disposing of scrap tires is best for the environment?  
 (A) burning the tires (B) dumping the tires in a lake (C) burying the tires in a landfill (D) taking the tires to a recycling center
Example Output:
D