A centrifuge will satisfactorily remove which of the listed substances from lube oil?

Correct Answer: Option C — Carbon particles

Centrifugal purifiers utilize high-speed rotation to separate substances based on density differences. Carbon particles, being significantly denser than lubricating oil, are effectively forced to the periphery of the bowl. Conversely, fuels like gasoline or diesel have densities too close to oil to be separated efficiently by standard centrifugal force.