Given the task definition and input, reply with output. 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").

A man wants to create a room that he can light up with the flick of a switch. To do this, he sends some electricity into a completed electrical circuit, through a conductor, which allows (A) light from the sun to shine (B) lights to be burned out (C) sunlight to shine through bulbs (D) his plan to succeed
D