Let (x, y) be any point on the parabola $$y^2 = 4x$$. Let P be the point that divides the line segment from (0, 0) to (x, y) in the ratio 1:3. Then the locus of P is

A

$$x^2 = y$$

B

$$y^2 = 2x$$

C

$$y^2 = x$$

D

$$x^2 = 2y$$