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").

[Q]: The basic outside of our planet is comprised of (A) types of stone (B) frozen green grass (C) solid ice balls (D) molten hot lava
[A]: A

[Q]: An early example of harnessing wind power would be (A) unicorns (B) santas flying reindeer (C) trumps windy speeches (D) cloth on masts
[A]: D

[Q]: You can eventually obtain water from a lake even if it's (A) frozen (B) gone (C) evaporated (D) dry
[A]:
A