If M, I, R, E, F, and Y are the bending moment, moment of inertia, radius of curvature, modulus of
elasticity stress and the depth of the neutral axis at section, then
(A) M/I = R/E = F/Y
(B) I/M = R/E = F/Y
(C) M/I = E/R = E/Y
(D) M/I = E/R = Y/F