What ingredient is used in a Manhattan cocktail?

The Manhattan cocktail is a classic drink that combines several key ingredients, making option "D. All of the above" the correct choice.

In a traditional Manhattan, sweet vermouth is used as a primary ingredient, which contributes its rich, sweet flavor and depth to the cocktail. Additionally, dry vermouth can sometimes be a component in variations of the Manhattan, although it is less common in the classic recipe.

Angostura bitters are also essential in the preparation of a Manhattan, as they add complexity and balance the sweetness of the vermouth. The use of bitters provides aromatic notes that enhance the overall flavor profile of the cocktail.

Therefore, all these ingredients—sweet vermouth, dry vermouth (in some variations), and Angostura bitters—play a crucial role in defining the Manhattan, confirming that all listed ingredients together create the quintessential version of this beloved cocktail.