A particle of mass \(m\) and positive charge \(q\) is launched into a region containing a uniform magnetic field \(\vec{B}\) directed along the \(+z\)-axis. The initial velocity \(\vec{v}_0\) of the particle has magnitude \(v_0\) and makes an angle \(\theta\) with the \(+z\)-axis, where \(0 < \theta < \dfrac{\pi}{2}\). The resulting trajectory is a helix winding around the \(z\)-axis. Which of the following expressions represents the pitch \(p\) of the helix (the distance traveled along the \(z\)-axis during one complete revolution)?