The Basic Idea Behind the Planetesimal Hypothesis Is That

The basic idea behind the planetesimal hypothesis is that

A) small grains of cosmic dust and other solids gradual accrete to form planetesimals that may grow to become protoplanets and eventually planets.
B) cosmic debris from the Big Bang coalesced to form planets as they neared the gravitational pull of the Sun.
C) planets form as a direct result of the nuclear fusion of nebular gases.
D) early in the Solar System's history,a star passed near the Sun and pulled off gases that eventually condensed to form planets.
E) planets form from the remains of super-giant planetesimals that blow apart,thereby creating smaller objects-the planets.