[单选题]
A wire moves across a magnetiblrh0)h d0jr) anr3p ,y g6/ehc a+ w*ec5x,wb oy (*pp2vxm7ur field. The $emf$ produced in the wire depends on
A. the strength of the magnetic field.
B. the length of the wire.
C. the orientation of the wire with respect to the magnetic field vector.
D. all of the given answers
