A vessel contains a liquid 1 of density $$0.8\,\text{g cm}^{-3}$$ over a liquid 2 of density $$13.6\,\text{g cm}^{-3}$$. The two liquids are immiscible. A homogeneous solid sphere floats with half of its volume immersed in liquid 1 and the other half in liquid 2. The density of the material of the sphere in $$\text{g cm}^{-3}$$ is

A

$$3.3$$

B

$$6.4$$

C

$$7.2$$

D

$$12.8$$