The "Endosymbiotic Hypothesis" Is a Concept That Explains _____

The "endosymbiotic hypothesis" is a concept that explains _____.

A) how eukaryotic cells might have evolved mitochondria and chloroplasts within their cells
B) how plant cells produce usable cellular energy from sunlight
C) why ribosomes are only found in the eukaryotic cytoplasm,never inside an organelle
D) why mitochondria and chloroplasts are so unlike each other
E) why chromosomes are only found inside the nucleus of a eukaryotic cell