In the machinery space of all uninspected motor vessels, there must be one type B-II hand portable fire extinguisher for every ______. (Unispected Vessel Regulations)

A
500 S.H.P. of the main engines
B
1000 S.H.P. of the main engines
C
500 B.H.P. of the main engines
D
1000 B.H.P. of the main engines
E