the moment of resistance (left(m_{r} ight)) of a beam is (a) directly proportional to the section modules

the moment of resistance \(\left(m_{r}\right)\) of a beam is

(a) directly proportional to the section modules ( \(\mathrm{z}\) ) of the beam

(b) \(m_{r} \times \frac{1}{z}\)

(c) \(m_{r} \times z^{2}\)

(d) \(m_{r} \times \frac{1}{z^{2}}\)