What is the primary whiskey used in a Washington Apple cocktail?

The primary whiskey used in a Washington Apple cocktail is Crown Royal, which is a brand of Canadian whisky. This cocktail is known for its sweet and fruity flavor profile, which comes from the combination of Crown Royal, apple schnapps, and cranberry juice. The use of Crown Royal brings a smooth and slightly sweet character that balances well with the tartness of the cranberry juice and the sweetness of the apple schnapps.

In the context of the other options, Jameson is an Irish whiskey and is not typically used in this specific cocktail. Tequila is a completely different type of spirit, usually associated with cocktails like Margaritas and does not fit the flavor profile of a Washington Apple. Vodka, while being a versatile spirit, is not the traditional base for this cocktail, as it lacks the distinct flavor that Crown Royal imparts. Thus, Crown Royal is the correct choice due to its significance in creating the authentic taste of a Washington Apple cocktail.