83. What statement is true concerning heat transfer rates by the heat transfer mode of natural convection?

Heat transfer rates are inversely proportional to the difference in fluid densities which, in turn, is directly proportional to the temperature gradient.
Heat transfer rates are inversely proportional to the difference in fluid densities which, in turn, is inversely proportional to the temperature gradient.
Heat transfer rates are directly proportional to the difference in fluid densities which, in turn, is inversely proportional to the temperature gradient.
Heat transfer rates are directly proportional to the difference in fluid densities which, in turn, is directly proportional to the temperature gradient.

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