Answer:
It confirmed the double stranded structure of the DNA.
Step-by-step explanation:
Watson and Crick created the DNA model that showed the DNA is a double stranded and helical molecule.
Rosalind Franklin is best known for her work on the X-ray diffraction images of DNA. Especially her x-ray numbered photo 51.
It was very instrumental to Watson and Crick in deducing the double helix model of the DNA. The photo showed a clear diffraction pattern of the crystallized DNA.