The Magnetic Flux Through a Certain Coil Is Given by $\pi$

Multiple Choice

The magnetic flux through a certain coil is given by where the units are SI.The coil has 100 turns.The magnitude of the induced EMF when t = 1/200 s is

A) 100 V
B) 200 V
C) zero
D) 2/ $\pi$ V
E) 1/50 $\pi$ V