Instructions: 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").
Input: Canyons are generally old, huge, and breathtaking and are (A) brimming to full with sand (B) filled with local wildlife (C) dirty and muddy inside (D) typically materialized with stone
Output:
D