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").

Ex Input:
heat and pressure change the remains of what into natural gas? (A) leaves (B) cans (C) books (D) cars

Ex Output:
A


Ex Input:
A wolf would eat (A) an ibex (B) a mountain (C) a tree (D) a cloud

Ex Output:
A


Ex Input:
A place without a sand bar is indicative of which of these characteristics? (A) a flow of sedimentation to settle (B) a stacking of silty sediments (C) a downstream movement without sediments (D) a rapid movement of sediments for downward deposit

Ex Output:

C