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:
which form of transportation has zero emissions? (A) motorbikes (B) speed boats (C) hybrid cars (D) pedal bikes

Ex Output:
D


Ex Input:
an example of converting potential energy to kinetic energy is (A) a resting bird (B) a still rock (C) our own sun (D) cars spinning tires

Ex Output:
D


Ex Input:
A person needing to use a renewable resource would consider all with the exception of (A) solar energy (B) water source (C) hydrocarbon gas mixture (D) wind power

Ex Output:

C