Which Description Best Supports the Endosymbiotic Theory of Organelles

Which description best supports the endosymbiotic theory of organelles?

A) Eukaryotic cells acquired mitochondria and plastids by engulfing free-living bacteria and developed a symbiotic relationship with them.Mitochondria were derived from anaerobic bacterium while chloroplasts were derived from aerobic bacterium.
B) Eukaryotic cells acquired mitochondria and plastids by engulfing free-living bacteria and developed a symbiotic relationship with them.Mitochondria were derived from aerobic bacterium while chloroplasts were derived from cyanobacterium.
C) Eukaryotic cells acquired nuclei and flagella by engulfing free-living bacteria and developed a symbiotic relationship with them.Nuclei were derived from aerobic bacterium while flagella were derived from motile bacteria.
D) Eukaryotic cells acquired mitochondria and flagella by engulfing free-living bacteria and developed a symbiotic relationship with them.Mitochondria were derived from aerobic bacterium while flagella were derived from motile bacteria.