Let the mean and the variance of seven observations 2, 4, $$\alpha$$, 8, $$\beta$$, 12, 14, $$\alpha < \beta$$, be 8 and 16 respectively. Then the quadratic equation whose roots are $$3\alpha + 2$$ and $$2\beta + 1$$ is :

A

$$x^2 - 35x + 306 = 0$$

B

$$x^2 - 41x + 420 = 0$$

C

$$x^2 - 45x + 506 = 0$$

D

$$x^2 - 37x + 342 = 0$$