exactly eight rock band -A,B,C,D,E,F,G and H- perform consecutively at a showcase on Friday night. no band performs more than once and no two bands perform simultaneously. the following conditions apply:
G and D both perform at some time before C
F performs at some time before E
G performs at some time before B
H performs at some time after F
A performs at some time before H and at some time after C

Which of the following could be the order of the performances of first to last?

A. D,G,C,A,E,F,H,B

B. G,B,A,D,F,C,H,E

C. D,G,B,C,A,H,F,E

D. G,D,B,C,F,A,H,E

Answer: Option D