A point on the parabola $y^2 =18 x$ at which the ordinate increases at twice the rate of the abscissa is

Question

( A ) $(2, 4)$
( B ) $(\frac{-9}{8}, \frac{9}{2})$
( C ) $(2, -4)$
( D ) $(\frac{9}{8}, \frac{9}{2})$