The excess pressure inside a soap bubble is equal to 2 mm of kerosene (density $$0.8\ \text{g cm}^{-3}$$). If the diameter of the bubble is 3.0 cm, the surface tension of soap solution is

A

$$39.2\ \text{dyne cm}^{-1}$$

B

$$45.0\ \text{dyne cm}^{-1}$$

C

$$51.1\ \text{dyne cm}^{-1}$$

D

$$58.8\ \text{dyne cm}^{-1}$$