[单选题]
A wire moves across a mat4lbx3yc 6h k4ffy cdttabnu5r (g y.-xj)2+9 gnet4 +,5fs h f44jb1pinu3ny enbz kow4/wic 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
