Answer:Correct ans is alternating current(AC CURRENT)
Explanation:Most houses in the U.S use alternative current for lights,fridges e.t.c that why when you turn of a switch in a room that particular rooms light goes off it doesn't affect the other rooms like what a direct current will do
Well how about direct current you Ask?
direct currents are also used in most homes examples are door alarms smoke detectors e.t.c