In this task, you are given a multiple-choice question and you have to pick the correct option. Answer with option indexes (i.e., "A", "B", "C", and "D").

Example Input: Thick feathers can be used for (A) climbing, cracking nuts and peeling fruit skins. (B) courtship and looking for food (C) killing prey, preening and feeding young (D) staying weatherproof, flexible and free of bacteria
Example Output: D

Example Input: An example of an electrical circuit running properly would be (A) dimming lights (B) swimming in pools (C) running outside (D) riding bikes
Example Output: A

Example Input: the availability of soil nutrients in the food chain can be explained by which of these? (A) the soil emanates nutrients into the air (B) the primary producers depend on the soil (C) all living things eat sand (D) the water we drink is from the soil
Example Output:
B