The Double-Helix model for the structure of DNA was proposed by:

The correct answer is Option (2) → James Watson and Francis Crick

Option (2) James Watson and Francis Crick — Correct. James Watson and Francis Crick proposed the double-helix model of DNA in 1953, based on the X-ray diffraction data of Maurice Wilkins and Rosalind Franklin.

NCERT Extract:
Structure of Polynucleotide Chain – “… DNA as an acidic substance present in nucleus was first identified by Friedrich Meischer in 1869. He named it as ‘Nuclein’. However, due to technical limitation in isolating such a long polymer intact, the elucidation of structure of DNA remained elusive for a very long period of time. It was only in 1953 that James Watson and Francis Crick, based on the X-ray diffraction data produced by Maurice Wilkins and Rosalind Franklin, proposed a very simple but famous Double Helix model for the structure of DNA.”