With reference to the hypothesis of the origin of planets, which of the following statements is correct?

• A. The planets are formed due to the aggregation of all the matter of nine rings separated from the nebula in the form of nine knots.
• B. The planets have been formed due to the different aggregation of all the material of the nine rings that came back from the original one ring from the nebula.
• C. Planets are formed due to the agglomeration of planets.
• D. Planets are formed from filaments.