A purely cohensive soil was tested by unconfined compression test .The mean unconfined compression strength was obtained as 50 $$\frac{kN}{sq.m}$$. The net ultimate bearing capacity of the soil adopting terzaghils concept will be (adopt bearing capacity factor =5.7,1 kg approximately equal to 10 N)

A

90 $$\frac{kN}{sq.m}$$

B

120 $$\frac{kN}{sq.m}$$

C

142.50 $$\frac{kN}{sq.m}$$

D

162.50 $$\frac{kN}{sq.m}$$