Which two flavor components are present in all white wines?

The selection of apple and citrus as flavor components present in all white wines is accurate due to the predominant characteristics found in the majority of white wine varieties.

Apple flavors are commonly associated with many white wine grapes, especially those like Chardonnay, Sauvignon Blanc, and Riesling. These varietals often exhibit crisp, fresh apple notes that are part of their essential profile.

Citrus flavors, too, are ubiquitous in white wines. Many white wine grapes can produce a range of citrus notes, from lemon and lime to grapefruit and orange. This citrus characteristic is especially prevalent in varietals such as Sauvignon Blanc, known for its zesty and bright acidity, which complements the fruitiness.

These two flavor components—apple and citrus—serve as a baseline for the flavor profiles in a wide array of white wines, illustrating the variety and character inherent in this category of wine. Other options provided, while they may describe flavors found in certain specific wines, do not have the same widespread significance and presence across the spectrum of white wines.