A Steel Pipe $\left(d_{3}=104 \mathrm{~mm}, d_{2}=96 \mathrm{~mm}\right)$ Has a Plastic Liner with Inner Diameter

A steel pipe $\left(d_{3}=104 \mathrm{~mm}, d_{2}=96 \mathrm{~mm}\right)$ has a plastic liner with inner diameter $d_{1}=82 \mathrm{~mm}$ . The modulus of elasticity of the steel is 75
Times that of the modulus of the plastic. Allowable stresses in steel and
Plastic are 40 MPa and 550 kPa, respectively. The allowable bending
Moment for the composite pipe is approximately: (A) $1100 \mathrm{~N} \cdot \mathrm{m}$
(B) $1230 \mathrm{~N} \cdot \mathrm{m}$
(C) $1370 \mathrm{~N} \cdot \mathrm{m}$
(D) $1460 \mathrm{~N} \cdot \mathrm{m}$