The correct answer is B) Injector cooling water tank and piston cooling water drain tank. The reasoning for this is that the injector cooling water tank and piston cooling water drain tank are more likely to have oil separation capability compared to the other options. These tanks handle water that has a higher potential for oil contamination, as they are directly connected to the engine components that use lubricating oil. Having oil separation capability in these tanks helps prevent oil from entering the freshwater cooling system and damaging engine components. The other options, such as the SSDG fresh water expansion tank and main engine jacket water cooling expansion tank, are less likely to require oil separation since they handle water that is further removed from the engine's lubricating oil system.