Final answer:
Option D: Keep large amounts of combustibles away from oil, grease, and other petroleum products to prevent fires, as these substances are prone to combustion and can release significant heat energy when ignited.
Step-by-step explanation:
When working near oil, grease, and other petroleum products, keep large amounts of combustibles away from them. Petroleum products, being hydrocarbon compounds, are highly flammable and their combustion can release large amounts of heat energy. Therefore, introducing substances that can easily catch fire or combust into the environment that contains petroleum products can significantly increase the risk of a fire or explosion.
It's important to note that crude oil is less dense than water, hence, it floats. This means that if a fire occurs, the oil would be on the water surface, making it harder to extinguish since water might not be able to effectively absorb the heat. Oxygen is another component that supports combustion, but in typical storage or operational environments, it is not feasible to control the amount of ambient oxygen. Therefore, the actionable safety measure is to ensure that combustible materials are not present.