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: Two ships grazing each other as they pass will (A) cause mayhem (B) sink them (C) speed them up (D) slow them down

SOLUTION: D

PROBLEM: As vehicles become more efficient petro consumption (A) increases (B) stops (C) decreases (D) stay the same

SOLUTION: C

PROBLEM: Materials like ethanol are used to produce electricity by _____. (A) hydroelectric power (B) renewable energy (C) burning (D) carbon fixation

SOLUTION:
C