Which Piece of Evidence Best Supports the Endosymbiotic Theory of Organelle

Which piece of evidence best supports the endosymbiotic theory of organelle evolution?

A) Mitochondria and chloroplast are the same size as bacteria.
B) Mitochondria and chloroplast divide by binary fission.
C) Mitochondria and chloroplast both contain DNA and some can make their own proteins.
D) The outer membrane of chloroplast and mitochondria resemble that of a eukaryotic cell while the inner membrane resembles that of a bacterial cell.
E) All of these are correct.