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:
An action that may provide a small bit of warmth could be (A) looking out of a window (B) putting the radio on (C) looking at a snow storm (D) smashing hands together repeatedly

Ex Output:
D


Ex Input:
Jeff noticed that the big dipper was in a different spot in the sky at 2am than where it was at 10pm. Why? (A) because of the earth's orbit (B) the stars had rotated (C) Jeff had been instantly transported thousands of miles from where he'd been at 10pm. (D) the earth had turned

Ex Output:
D


Ex Input:
Science fact: a cavern is formed by carbonic acid in groundwater seeping through rock and dissolving (A) sedimentary rock which is  composed mainly of skeletal fragments of marine organisms such as coral, forams and molluscs, (B) metamorphic rocks that are formed under the surface of the earth from the metamorphosis, (C) igneous rocks which are formed when magma  cools and hardens or (D) artist who play the music genre called rock and roll.

Ex Output:

A