Let chord PQ of length $$3\sqrt{13}$$ of the parabola $$y^2 = 12x$$ be such that the ordinates of points P and Q are in the ratio 1:2. If the chord PQ subtends an angle $$\alpha$$ at the focus of the parabola, then $$\sin \alpha$$ is equal to:

A

$$\frac{3}{5}$$

B

$$\frac{4}{5}$$

C

$$\frac{5}{13}$$

D

$$\frac{12}{13}$$