A closed thin-walled tube has thickness, $t,$ mean enclosed area within the boundary of the centerline of tube's thickness, $A_{m},$ and shear stress, $\tau$. Torsional moment of resistance, $T,$ of the section would be

(A) $0.5 \tau A_{m} t$

(B) $\tau A_{m} t$

(C) $2 \tau A_{m} t$

(D) $4 \tau A_{m} t$

A closed thin-walled tube has thickness, $t,$ mean enclosed area within the boundary of the centerline of tube's thickness, $A_{m},$ and shear stress, $\tau$. Torsional moment of resistance, $T,$ of the section would be

(A) $0.5 \tau A_{m} t$

(B) $\tau A_{m} t$

(C) $2 \tau A_{m} t$

(D) $4 \tau A_{m} t$

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