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:
If one mineral can scratch another mineral then that other mineral is softer than that one mineral, as can be tested with (A) a diamond and steel (B) a rock and glass (C) a diamond and agate (D) a ruby and salt

Ex Output:
C


Ex Input:
The cell of a plant when photosynthesizing may most require (A) access to roofless space (B) a complete vacuum in space (C) a room with blackened windows (D) dark basement living quarters

Ex Output:
A


Ex Input:
The insect's cocoon being created occurs during the (A) adult stage in a life cycle (B) egg formation in a life cycle (C) stage when wings first start to form (D) final stage in a life cycle

Ex Output:

C