The cross-sectional area of the embankment of a canal fully in embankment,(refer the figure given below) is:-

A

$$\frac{1}{2}(b_{1}+b_{2})h$$

B

$$(b_{1}+b_{2})h+Sb_{2}$$

C

$$(b_{1}+b_{2})+2Sh_{2}$$

D

$$2[(b_{1}+b_{2})(b+sh)]$$