A Hollow Aluminum Shaft (G = 27 GPa $d_{2}=96 \mathrm{~mm}$ And $d_{1}=52 \mathrm{~mm}$

A hollow aluminum shaft (G = 27 GPa, $d_{2}=96 \mathrm{~mm}$ and $d_{1}=52 \mathrm{~mm}$ has an angle of twist per unit length of 1.8 °/m due to torques T. The resulting maximum tensile stress in the shaft is approx-
Imately: (A) $38 \mathrm{MPa}$
(B) $41 \mathrm{MPa}$
(C) $49 \mathrm{MPa}$
(D) $58 \mathrm{MPa}$