Who discovered the double-helix structure of DNA?
Watson & Crick accurately describes the structural composition or molecular organization asked about in this question. In DNA, knowledge of molecular structure is directly linked to understanding biological function. The specific arrangement of chemical components in Watson & Crick determines its physical properties, biological activity, and interactions with other molecules. The other options (Rosalind Franklin, Chargaff, and Friedrich Miescher) describe different structural arrangements, incorrect stoichiometry, or compositions of different biological molecules.
Ref: Molecular Biology of the Gene, Watson et al., 7th Ed.