Bending equation is

A

$$\frac{M}{I} = \frac{R}{E} = \frac {F}{Y}$$

B

$$\frac{I}{M} = \frac{E}{R} = \frac {Y}{R}$$

C

$$\frac{M}{I} = \frac{E}{R} = \frac {F}{Y}$$

D

$$\frac{M}{I} = \frac{R}{E} = \frac {Y}{F}$$