A progressive wave travelling along the positive x-direction is represented by $$y(x, t) = A\sin(kx - \omega t + \phi)$$. Its snapshot at t = 0 is given in the figure.

For this wave, the phase $$\phi$$ is:

A

$$\frac{\pi}{2}$$

B

0

C

$$\pi$$

D

$$-\frac{\pi}{2}$$