The correct answer is the size of the object.
The size of the object itself does not inherently affect the amount of temperature increase for a given amount of heat added, because the temperature change also depends on the specific heat capacity of the material and the amount of heat added. Therefore, while larger objects may take more heat to change their temperature, the size alone does not affect the temperature increase for a specified quantity of heat. The other options—how much caloric (heat) was added, the material of which the object is made, and how much heat was added—directly influence the temperature change.
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