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: An example of replacing a natural resource like copper might be (A) recovering ores (B) running around (C) throwing up (D) using plastic straws
Example Output: A

Example Input: The cell membrane keeps a cell from (A) replicating (B) getting lost (C) falling apart (D) running away
Example Output: C

Example Input: As frozen water decreases more sunlight is (A) absorbed (B) frozen (C) detected (D) reflected
Example Output:
A