The abbreviation "C" refers to which of the following beverages?

The abbreviation "C" is commonly associated with Cappuccino in the context of coffee beverages. A cappuccino is a popular espresso-based drink that is typically made with equal parts espresso, steamed milk, and milk foam. When ordering or discussing coffee drinks, especially in cafes and among baristas, "C" is often used to quickly refer to this specific beverage due to its widespread popularity and distinct characteristics.

The other options, while representing drinks that might also be offered in a café setting, do not share the same common abbreviation or recognition as cappuccino does. For instance, carbonated water, coconut milk, and chamomile tea might be referred to by longer names or other descriptors in a beverage menu, which is why "C" aligns most closely with cappuccino in this scenario.