Use the Following Figure for the Next Problem $\circ$ So That One End Lies Along the Xy-Plane While

Multiple Choice

Use the following figure for the next problem.
-A rectangle is bent on two sides at 90 ^$\circ$ so that one end lies along the xy-plane while the other end lies along the xz-plane.The length a = 10 cm and b = 30 cm.At t = 0,a magnetic field of strength B = 0.1 T lies in the yz-plane and points at an angle $\theta$ = 30 ^$\circ$ and 10 ms later the field points in the opposite direction.The EMF induced in the rectangle is

A) 10.4 V
B) 6.0 V
C) 12 V
D) 8.2 V
E) None of these is correct.