When a current carrying coil is placed in a uniform magnetic field of induction `B`, then a torque `tau` acts on it. If `I` is the current, `n` is the number of turns and `A` is the face area of the coil and the normal to the coil makes an angle `theta` with `B`, Then
A. `tau= n I AB`
B. `tau= n I AB cos theta`
C. `tau = n I AB sin theta`
D. `tau = n I AB tan theta`