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: 2000 years ago, this method would likely have brought sand from the coast to the desert (A) the pyramids often eroded, making their own sand (B) constant breezes over time (C) human automobiles transfer materials (D) the space shuttle moved sand great distances
Example Output: B

Example Input: If you had a hammer, you would find ____ nails made of ____ (A) wood; wood (B) iron; wood (C) wood; iron (D) iron; iron
Example Output: D

Example Input: Cars driving over a stone road throughout a year, including hot days and cool nights, may cause the road to (A) evaporate (B) burn (C) flood (D) break up
Example Output:
D