In the Proto-Solar System Nebula,gravity Pulled Matter Together to Form

In the proto-solar system nebula,gravity pulled matter together to form larger bodies.As they collided,what happened to these bodies?

A) Oblique collisions caused individual bodies to spin.
B) The objects broke apart to form asteroids,much like a neutron colliding with a heavy atom produces fission.
C) The objects temporarily broke apart and then reformed into large objects,cooling rapidly during the breakup period.
D) Immense heat was released within the colliding bodies as gravitational potential energy was converted to heat.