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 Q]: heat and pressure change the remains of what into natural gas? (A) leaves (B) cans (C) books (D) cars
[EX A]: A

[EX Q]: Northern countries have extensive erosion due to (A) glacial liquification (B) cola mining (C) more frequent tornadoes (D) meteors
[EX A]: A

[EX Q]: Meadow vales are (A) carnivores (B) hard of hearing (C) very large (D) potatoes
[EX A]:
B