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: when the needle of a compass lines up with Earth 's magnetic poles , the needle is (A) pointing east (B) pointing west (C) pointing at arctic (D) pointing to space
Example Output: C

Example Input: Obstacles that might impede a dune are (A) God (B) emotions (C) cacti (D) cancers
Example Output: C

Example Input: Descending air pressure leads to (A) a lower chance of rain (B) an ascending chance of showers (C) a decreased likelihood of showers (D) has zero effect on the weather forecast
Example Output:
B