If $$(x_{i},y_{i}) = 1, 2, ......... , 9, 10$$ are the ranks of the variables X and Y respectively such that $$\sum (x_{i} - y_{i})^{2} = 30$$, then the rank correlation between the two variables is

A

$$\frac{9}{11}$$

B

$$\frac{10}{11}$$

C

$$\frac{9}{10}$$

D

$$\frac{8}{10}$$