5. When a diesel engine is equipped with a hydraulic starting system designed to operate at pressures of 150 psi or more, Coast Guard Regulations (46 CFR) require that the hydraulic fluid shall __________.

A. have a viscosity index number greater than 100
B. have a flash point of not greater than 200°F
C. have a flash point of not less than 315°F
D. be oxidation resistant and nontoxic