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:
A vehicle stops when brakes are pressed because (A) the tires are being halted by pressure (B) the streets are bumpy (C) the roads have friction (D) the tires are unable to create friction

Ex Output:
A


Ex Input:
Sunlight can (A) make eyes more visible (B) bounce from a rod (C) create a real problem (D) blind a garden gnome

Ex Output:
B


Ex Input:
A car running on a resource that will someday cease existing uses (A) dino remains (B) water power (C) solar power (D) electricity

Ex Output:

A