Which of the following grape varieties is commonly used in Piccadilly sparkling wines?

Chardonnay is widely regarded as a key grape variety in the production of sparkling wines, including those from the Piccadilly Valley in Australia. This region is known for its cool climate, which is conducive to growing high-quality Chardonnay. The grape's natural acidity and complex flavors make it ideal for sparkling wine production, particularly in the traditional method (Méthode Champenoise), where secondary fermentation occurs in the bottle.

Chardonnay brings a range of characteristics to sparkling wines, including fresh fruit notes, richness, and the ability to age well, allowing for the development of yeasty, toasty characteristics over time. This aligns perfectly with the style desired in sparkling wines, enhancing both their complexity and palate structure. Other grape varieties, while sometimes used in sparkling wine production, do not typically achieve the same level of recognition or widespread use as Chardonnay in this context.