Answer:
C. The sum of the areas of it's exterior surfaces
The lateral area of a three-dimensional figure is the sum of the areas of its exterior surfaces. Option C is correct.
All of an object's sides, excluding its base and top, are considered its lateral surface. The size of the lateral surface is referred to as its area.
This is to be distinguished from the total surface area, which consists of the base and top areas in addition to the lateral surface area.
Therefore, the lateral area of a three-dimensional figure is the sum of the areas of its exterior surfaces. Option C is correct.
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