Which statement is least likely to support the endosymbiotic theory?

Which statement is least likely to support the endosymbiotic theory?
a. Mitochondria and chloroplasts reproduce independently from the cell.
b. Mitochondria and chloroplasts contain their own ribosomes.
c. Mitochondria and chloroplasts have DNA that resembles bacterial DNA.
d. Mitochondria and chloroplasts are much larger than prokaryotic cells.