It's very simple to prove whether or not "exhaust density" powers a turbocharger. Just plug your exhaust pipe and see how much boost you get. After all, back pressure increases the density of the exhaust gasses.
The correct answer, which isn't on your list, is "exhaust energy". Specifically, it's the enthalpy of the exhaust gas leaving the turbo subtracted from the enthalpy of the exhaust gas entering the turbo. Combustion of unburned fuel COULD contribute to the exhaust energy, but 1) modern gas and diesel engines don't have a lot of unburned fuel leaving the combustion chamber, and 2) the fuel would have to burn prior to entering the turbo in order to contribute to the exhaust enthalpy.
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Today's Featured Article - A 1937 John Deere Unstuck - by Gary Hickman. Here is my story of how I got the pistons out of a 1937 JD B that the engine had been stuck for about 14 years: About 12 years ago my Dad gave me one of the tractors I ran as I was growing up on our farm in central Nebraska. The engine on this tractor, a 1937 John Deere "B", had been stuck for 2 years before he gave it to me. This last spring (1999) I hauled the tractor to our 2 acre lot in St. Libory Nebraska where it joined my antique machinery collection, at that time a 1929 Caterpillar T
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