There are 12 observations $$x_{1},x_{2}, ... ,x_{12}$$ and $$y_{1},y_{2}, ... ,y_{12}$$ of two variables x, y and $$d_{i} = x_{i} - y_{i}$$ for $$1 \leq i \leq 12$$. If $$\sum d_{i}^{2} = 65$$, then the coefficient of rank correlation is

A

$$\frac{7}{11}$$

B

$$\frac{7}{22}$$

C

$$\frac{17}{22}$$

D

$$\frac{17}{33}$$