Figure shows an equilateral triangle ABC of side l carrying currents as shown, and placed in a uniform magnetic field B perpendicular to the plane of triangle. The magnitude of magnetic force on triangle is

• A

  $\mathrm{i}\mathrm{l}\mathrm{B}$

• B

  $2\mathrm{i}\mathrm{l}\mathrm{B}$

• C

  $3\mathrm{i}\mathrm{l}\mathrm{B}$

• D

  zero