A Motor Drives a Shaft At $f=10 \mathrm{~Hz} \text { and delivers } P=35 \mathrm{~kW}$

A motor drives a shaft at $f=10 \mathrm{~Hz} \text { and delivers } P=35 \mathrm{~kW}$ of power. The allowable shear stress in the shaft is 45 MPa. The minimum
Diameter of the shaft is approximately: (A) $35 \mathrm{~mm}$
(B) $40 \mathrm{~mm}$
(C) $47 \mathrm{~mm}$
(D) $61 \mathrm{~mm}$