A Conducting Bar Moves to the Left at a Constant

Multiple Choice

A conducting bar moves to the left at a constant speed v on two conducting rails joined at the left as shown.As a result of the bar moving through a constant magnetic field,a current I is induced in the indicated direction.Which one of the following directions is that of the magnetic field?

A) toward the right
B) toward the left
C) parallel to the long axis of the bar
D) into the page
E) out of the page