instruction:
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").
question:
the presence of which of these is required for the formation of cavernous chambers? (A) some carbonated soda (B) some carbon dioxide (C) some carbonic acid (D) carbon monoxide gas
answer:
C


question:
a lighter object hue can lead to what? (A) none of these (B) positive charge in electricity (C) a bad electric conduction (D) ability to see yourself in it better
answer:
D


question:
The more that worms make their way through compost, the more (A) bees in skies (B) vitamins in dirt (C) trees in fields (D) snakes on planes
answer:

B