To Calculate the Flux Through a Curved Surface

Multiple Choice

To calculate the flux through a curved surface,

A) the area vector has to be perpendicular to the surface somewhere
B) you must divide the surface into pieces that are tiny enough to be almost flat
C) the surface must be spherical
D) the surface cannot be curved very much; then you can treat it as though it were flat
E) actually the flux through a curved surface cannot be calculated.