Which of the following is a key characteristic of Cote Rotie wines?

Côte Rôtie wines are renowned for their complexity and depth of flavor, which is highlighted by a rich bouquet of aromas including floral notes such as violets, spices like pepper, and dark fruit characteristics such as blackberry and plum. This aromatic complexity stems from the unique terroir of the region and the blend of predominantly Syrah with a small percentage of Viognier, which contributes to the floral aspects. The balance of these elements makes Côte Rôtie wines particularly esteemed among wine enthusiasts.

In contrast, other characteristics mentioned in the other options do not accurately represent Côte Rôtie. For instance, a high acidity with a light body would not capture the full-bodied and structured nature of these wines. Similarly, sweetness and low tannin levels are not typical of Côte Rôtie, as the wines are generally dry with pronounced tannins. Lastly, while oak may be used in the aging process, the predominant influence in Côte Rôtie is derived from the fruit and terroir rather than a heavy oak character. Thus, the complexity found in the aromas of Côte Rôtie is indeed a key defining feature of these wines.