A Small Airplane with a Wing Span of 12 M $\mu$

Multiple Choice

A small airplane with a wing span of 12 m flies horizontally and due north at a speed of 60 m/s in a region where the magnetic field of the earth is 60 $\mu$ T directed 60 $\degree$ below the horizontal.What is the magnitude of the induced emf between the ends of the wing?

A) 50 mV
B) 31 mV
C) 37 mV
D) 44 mV
E) 22 mV