The Origin of the Mitochondrion and Chloroplast by Endosymbiosis, Hypothesizes

The origin of the mitochondrion and chloroplast by endosymbiosis, hypothesizes that these organelles originated by

A) the fusion of two archean cells to form the eukaryote with the eukaryotic mitochondrion and chloroplast inside.
B) the absorption of RNA from prokaryotic cells.
C) prokaryotic cells being engulfed and becoming internal symbionts within an early eukaryotic cell.
D) only the absorption of DNA from dead prokaryotic cells used as food.
E) prokaryotic cells being engulfed and becoming external symbionts within an early bacteria cell.