Now consider the magnetic flux through a surface bounded by the loop. Which of the following statements about this surface must be true if you want to use Faraday's law to relate the magnetic flux to the line integral of the electric field around the loop?

A.) The surface must be the circular disk in the middle of the loop.

B.) The surface must be perpendicular to the magnetic field at each point.
C.) The surface can be any surface whose edge is the loop.
D.) The surface can be any surface whose edge is the loop as long as no magnetic field line passes through it more than once.