Arrange the following historical milestones in the development of antimicrobial therapy in the correct chronological order (from earliest to latest): 1. Discovery of Salvarsan by Paul Ehrlich 2. Accidental discovery of Penicillin by Alexander Fleming 3. Discovery of the antibacterial action of Prontosil by Gerhard Domagk 4. Synthesis of Sulfanilamide as the active metabolite of Prontosil

Options:

• A: 2-1-3-4
• B: 1-3-2-4
• C: 1-2-3-4
• D: 2-3-1-4

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