The Process of Accretion in Planetary Formation Is the

The process of accretion in planetary formation is the

A) slow accumulation of solid particles by gravity and collision into larger,solid objects.
B) slow acquisition from deep space by the giant planets of their complement of moons,by gravitational capture.
C) slow condensation by gravity of gas atoms into large dense gas clouds,which become the planets.
D) relatively rapid gravitational collapse (in less than 10⁶ years) of gas clouds to form planets.