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) 2ILB.
B) ILB.
C) IBL².
D) zero.