A boat is moving due east in a region where the earth's magnetic field is \[5.0\times {{10}^{-5}}N{{A}^{-1}}\,{{m}^{-1}}\] due north and horizontal. The boat carries a vertical aerial 2 m long. If the speed of the boat is\[1.50\,m{{s}^{-1}}\], the magnitude of the induced emf in the wire of aerial is

• A. 0.75 mV
• B. 0.50 mV
• C. 0.15 mV
• D. 1 mV