Which natural explanation (as of February 2021) has been forwarded about the Oumuamua object? A) A miniture black hole B) An object from a protoplanetary disk (i.e., planetesimal) to be extraordinarily porous C) A photonic object associated with a new generation of physics D) A hydrogen / nitrogen ice fragment, perhaps arising from collisions occurring on Pluto-like (or Triton-like) worlds