The term 'mutation' is given by:

Correct option is A

✅ (a) De Vries: • Hugo de Vries coined the term "mutation" while working on Oenothera (evening primrose). • Proposed mutation theory around 1901.
❌ (b) Morgan: • Known for work on fruit flies and linkage, not for coining the term.
❌ (c) Beadle and Tatum: • Known for "one gene-one enzyme" hypothesis.
❌ (d) Wolff: • Not associated with the term mutation.