There Is a Current I Flowing in a Clockwise Direction

Multiple Choice

There is a current I flowing in a clockwise direction in a square loop of wire that is in the plane of the paper. If the magnetic field B is toward the right, and if each side of the loop has length L, then the net magnetic torque acting on the loop is:

A) IBL².
B) 2ILB.
C) ILB.
D) zero.