The effective depth of a singly reinforced rectangular beam is 400 mm. The section is over reinforced and the neutral axis is 180 mm below the top. If the maximum stress attained by concrete is 5 $$\frac{N}{mm^{2}}$$ and the modular ratio is 18, then the stress developed in the steel will be

A

110 $$\frac{N}{mm^{2}}$$

B

135 $$\frac{N}{mm^{2}}$$

C

160 $$\frac{N}{mm^{2}}$$

D

180 $$\frac{N}{mm^{2}}$$