Who are they (people in the options)?
• Watson and Crick, = Two scientists that discovered that the DNA is double-stranded and has a unique structure.
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• Rosalind Franklin, = She used x-ray crystallography to produce an image of DNA.
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• Gregor Mendel ,= He is an Austrian monk that experimented on garden peas and formulated the now known "Mendelian Genetics".
ANSWER: A. = Rosalind Franklin despite producing a photo of DNA through x-ray crystallography failed to make a model for the DNA. Watson and Crick made the model out of Rosalind Franklin's images.