Final answer:
The main difference between the Pre and Post Prohibition Old Fashioned is the alcohol content and preparation method.
Step-by-step explanation:
The correct answer is:
b) Alcohol content and preparation method
The main differences between the Pre-Prohibition and Post-Prohibition versions of the Old Fashioned cocktail lie in the alcohol content and the preparation method.
Pre-Prohibition Old Fashioned cocktails typically contained a higher alcohol content. They were crafted using rye whiskey as the primary spirit. During the Prohibition era and following it, bourbon became more commonly used due to its widespread availability.
Additionally, the preparation method differed between the two eras. The Pre-Prohibition Old Fashioned was simpler, focusing on the essential elements: whiskey, sugar, bitters, and water or ice. Post-Prohibition, it became more common to muddle fruit, particularly oranges and cherries, along with sugar and bitters, before adding the whiskey and ice. This altered preparation method resulted in a slightly modified taste profile compared to the earlier version.