Which glass is the smallest and holds only 6 oz?

The juice glass is indeed the smallest of the options listed, typically designed to hold a volume of around 6 ounces. Juice glasses are specifically made for serving non-alcoholic beverages, often in smaller portions, making them an appropriate choice for a variety of juices and soft drinks.

In contrast, the white wine glass, while smaller than a standard wine glass, usually accommodates more than 6 ounces, as it is designed to allow the wine to breathe and be enjoyed at its best. The water glass generally holds a larger capacity as well, usually around 8 to 12 ounces, to provide an adequate supply of water for dining. The sherry glass is also designed for a small serving of sherry, but it typically holds a bit more than a juice glass, around 4 to 7 ounces, depending on the specific design.

Thus, the juice glass is characterized by its intended use and capacity of 6 ounces, making it the correct answer to this question.