51. Each member of a family of six owns a computer rated at 500 watts in a 120 V circuit. If all computers are plugged into a single circuit protected by a 20 ampere fuse, what is the maximum number of the computers can be operating at the same time?
(A) 2
(B) 3
(C) 4
(D) 5 or more
(A) 2
(B) 3
(C) 4
(D) 5 or more