Detailed Instructions: 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: Magma is sourced in volcanoes and (A) is high enough kelvin to melt steel (B) on the desert plains (C) is beneath the aliens (D) can freeze water at all times
A:
A