The discovery that supported the endosymbiotic theory is the DNA in mitochondria. Thus, the correct option is A.
What is Endosymbiotic theory?
Endosymbiotic theory may be defined as a theory that illustrates the discovery or origination of eukaryotic cells from prokaryotic organisms such as alpha-proteobacteria and cyanobacteria.
The DNA in mitochondria of the eukaryotic cell followed by DNA in the location of chloroplast of the eukaryotic cell overall reveals the discovery of endosymbiotic theory.
Therefore, the discovery that supported the endosymbiotic theory is the DNA in mitochondria. Thus, the correct option is A.
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