A pipe contain an oil of specific gravity 0.9 . A differential manometer connected at two points A and B shows a difference in mercury levels as 15 cm . The difference of pressure at two points A and B will be (Note: consider the density of mercury as 13600 $$\frac{kg}{m^{3}}$$)

A

18688 $$\frac{N}{m^{2}}$$

B

15981 $$\frac{N}{m^{2}}$$

C

288 $$\frac{N}{m^{2}}$$

D

6528 $$\frac{N}{m^{2}}$$