2. Between 3:00 am. and 3:00 p.m. of the same day, the
minute hand of a properly operating clock, indicated by the
figure above, will turn through how many degrees?
(A) 0
(B) 1,200
(C) 2,160
(D) 4,320
(E) 8,640

official answer is D. I cant get a grip on he concept. can someone explain.