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: Which of these objects could combust (A) Seashells (B) Grass (C) A cat (D) A paint can

SOLUTION: D

PROBLEM: adding a direct flame to container of acid causes a (A) dormant cycle (B) lot of nothing (C) lower temperature (D) vapor expulsion

SOLUTION: D

PROBLEM: What is most necessary for a  bitcoin operation (A) abacus (B) metal (C) plastic (D) wood

SOLUTION:
B