The Magnitude of the Torque Produced by a Magnetic Moment $\mu$

Multiple Choice

The magnitude of the torque produced by a magnetic moment $\mu$ = 2.0 (2i + j) A·m² in a magnetic field given by 1.5 (i + k) mT is

A) 3.0 (i - 2j - 2k) mN·m.
B) 9.0 mN·m.
C) 3(-i + 2j - 2k) mN·m.
D) zero.