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: Factories often add something to the environment that is (A) helpful (B) productive (C) sanitizing (D) posionous
Example Output: D

Example Input: Webbed feet aid in what (A) penguins laying eggs on ice (B) fish hiding in coral reefs (C) gulls dive bombing fish from the sea (D) ducks chasing prey underwater
Example Output: D

Example Input: An example of a house hold item that could be an insulator could be (A) Diamonds (B) Silver (C) Gold (D) Tupperware
Example Output:
D