In the calculation of rank correlation coefficient (r) of 8 observations it is found that $$\sum d_{i}^{2} = 40.5$$. Where $$d_i$$ are the deviations. Then the value of r is

A

$$\frac{27}{56}$$

B

$$\frac{29}{56}$$

C

$$\frac{31}{56}$$

D

$$\frac{33}{56}$$