A singly reinforced beam has breadth b, effective depth d, depth of neutral axis n and critical neutral axis n1. If fc and ft are permissible compressive and tensile stresses, the moment to resistance of the beam, is____________________?

A. n1 (1 n1/3) cbd

B. All the above

C. bn (fc/2) (d n/3)

D. Atft (d n/3)

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