Help with understanding this logic question.

After 1 pm sonething went wrong with the mechanism of a certain clock and at 1.30 pm it struck 2 hours. Then went on striking every half an hour in the routine way indicating wrong hours. Find out when did it strike the correct hour next?
(A) 12.30 am
(B) 11 pm
(C) 6.30 pm
(D) Never