One Piece of Evidence in Support of the Endosymbiotic Theory

One piece of evidence in support of the endosymbiotic theory is that ____.

A) mitochondria, plastids, and bacteria have cell walls of the same composition
B) mitochondria and plastids are similar in size to bacteria
C) mitochondria and plastids are similar in structure to archaea
D) plastids can live free of a eukaryotic cell
E) mitochondria and cyanobacteria process energy similarly