TASK DEFINITION: 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").
PROBLEM: heat and pressure change the remains of what into natural gas? (A) leaves (B) cans (C) books (D) cars

SOLUTION: A

PROBLEM: A plastic toy reduced to a puddle was left on a (A) steep mountain (B) iceberg (C) government propaganda flick (D) hotplate

SOLUTION: D

PROBLEM: The supply of natural gas (A) is renewable thru more mining (B) depletes without replenishment with every use (C) comes from synthetic creation (D) should be used as much as possible

SOLUTION:
B