Which of the following would contribute to the formation of an oil and water emulsion, in addition to acid formation?

Correct Answer: Option D — Water, agitation, and heat

Stable emulsions in marine lubrication systems require the presence of water, mechanical agitation, and elevated temperatures. Agitation mixes moisture and oil, while heat accelerates oxidation, creating acidic sludges that destroy lubricating film integrity and cause severe bearing wiping.