Name a popular sparkling wine produced in California.

California is known for producing a variety of high-quality sparkling wines, with "California Champagne" being a term frequently associated with premium sparkling wine from the region. The name "California Champagne" was popularized by producers in the late 20th century, particularly with the rise of méthode champenoise, or traditional method, which is also used in the production of Champagne in France. These wines can be made from various grape varieties, including Chardonnay and Pinot Noir, and are crafted using the same techniques employed in Champagne production, often resulting in complex and refined sparkling wines.

This choice reflects both the geographic location (California) and the acknowledged production techniques that align with the characteristics of authentic Champagne, even if the term "Champagne" itself is regulated and technically reserved for the wines from the Champagne region in France.

The other options refer to sparkling wines from different regions: Prosecco is primarily produced in Italy, Cava is a Spanish sparkling wine, and Crémant is a French sparkling wine made outside of the Champagne region. These are notable sparkling wines but do not pertain to California's production specifically.