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: Flowers with more pollinators (A) escalate reproduction (B) increase water usage (C) increase visual appeal (D) decrease reproduction
Example Output: A

Example Input: Volcanoes, have a (A) Esophagus (B) Camels (C) Emotional experience (D) Cigarettes
Example Output: A

Example Input: mechanical weathering is breaking down what by mechanical means? (A) hills (B) trees (C) knolls (D) boulders
Example Output:
D