Instructions: 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").
Input: which one of these would ensure the least amount of risk to make contact with? (A) an electric wire wrapped in water (B) an electric wire wrapped in metal (C) an electric wire wrapped in steel (D) an electric wire wrapped in thick cotton
Output:
D