science @elena please help

it has been hypothesized that chloroplasts originated from photosynthetic cyanobacteria that became symbiotic inside a host cell. Which of the following observations provides the strongest evidence for this suggestion?
A) microscopically, chloroplast appear similar to cyanobacteria
B) chloroplast DNA shows clear similarities to cyanobacterial DNA
C) both chloroplast and cyanobacteria are green and perform photosynthesis
D) Photosynthetic cyanobacteria and fungi form a mutualistic association in lichen

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  1. D. photosynthetic cyanobacteria and fungi form a mutualistic associatio in lichen

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  2. The answer is B

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