Workers at a water treatment plant open eight valves-G,H,I,K,L,N,O, and P-to flush out a system of pipes that needs emergency repairs. To maximize safety and efficiency, each valve is opened exactly once, and no two valves are opened at the same time. The valves are opened in accordance with the following conditions:
Which one of the following could be the order, from first to last, in which the valves are opened?
A. P,I,K,G,N,H,O,L
B. P,G,K,N,L,H,O,L
C. G,K,I,P,H,O,N,L
D. N,K,P,H,O,I,L,G
E. K,I,N,G,P,H,O,L
ANSWER : A