The speed of driving shaft of a Hooke's joint of angle \(19.5^{\circ}\) (given \(\sin 19.5^{\circ}=.33, \cos 19.5^{\circ}=.94\) ) is \(500 \mathrm{rpm}\). The maximum speed of the driven shaft is nearly

(a) \(168 \mathrm{rpm}\)

(b) \(444 \mathrm{rpm}\)

(c) \(471 \mathrm{rpm}\)

(d) \(531 \mathrm{rpm}\).