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: This can be used to light up a light bulb (A) grass (B) dirt (C) stones. (D) biofuel

SOLUTION: D

PROBLEM: Drinking cola daily removes layers from the surface of (A) enamel on molars (B) spoons (C) porcelain (D) the coffee pot

SOLUTION: A

PROBLEM: Eric is pushing a box up a ramp. He notices that it is much more difficult than it was a couple of hours earlier. This could be due to (A) The box is a lot lighter than it was earlier (B) the box being grey (C) his box being more voluminous (D) the ramp is more high angle then it was earlier

SOLUTION:
D