QUICK! Which best explains how the collisions of materials in space contribute to the formation of layers in protoplanets? A: The materials undergo decay when they collide, which results in the heating and subsequent melting and rising of materials.

B: The collisions release heat, which results in the heating and subsequent melting, sinking, and rising of materials.

C: The materials undergo decay when they collide, which results in the cooling and subsequent hardening and sinking of materials.

D: The collisions absorb heat, which results in the cooling and subsequent hardening and rising of materials.