Correct option is A
The DNA double helix structure was discovered in 1953 by James Watson and Francis Crick, based on X-ray diffraction images taken by Rosalind Franklin and Maurice Wilkins. Watson and Crick’s discovery of the double helix structure showed how DNA could carry genetic information and replicate. While Rosalind Franklin played a crucial role in capturing the images that led to the discovery, Watson and Crick are credited with proposing the model of the double helix.
Thus, the correct answer is (a) James Watson and Francis Crick.
