not A - no mention was made of revolution
So I'd say E
In the formula V = integral (a, b) A(u)du used to compute the volume of a solid:
A. the du can be thought of as representing the thickness of the axis of revolution
B. the function A(u) represents cross-sectional area
C. the function A(u) represents the area of the intersection between a plane (perpendicular to an axis) and the solid.
D. A and B
E. B and C
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