Which ingredient is a primary component of a Martini?

The primary component of a Martini is dry vermouth. A classic Martini comprises primarily gin and dry vermouth, which is used to enhance the flavor and complexity of the drink. The balance between these two ingredients is what defines a Martini’s character. Traditionally, the gin is the base spirit, while dry vermouth adds herbal and aromatic notes that complement the botanicals in the gin.

In the context of the other options, rye whiskey is typically associated with different cocktails, such as a Manhattan, and does not play a role in a standard Martini. Similarly, orange juice is characteristic of cocktails like the Screwdriver, and coconut cream is mostly used in tropical drinks, such as Pina Coladas. None of these can substitute for the essential dry vermouth in a Martini, making it the correct answer in this context.