Which dipping sauce is served with the calamari appetizer?

The dipping sauce that accompanies the calamari appetizer at Carrabba's is marinara sauce. This choice is correct because marinara sauce is a traditional Italian tomato-based sauce that complements the flavors of fried calamari well, enhancing its taste while adding a classic Italian touch. The pairing aligns with standard Italian cuisine practices, where seafood dishes are often served with tomato-based sauces.

Garlic aioli, while a popular dipping sauce for various appetizers, is not the signature accompaniment for calamari at this restaurant. Barbecue sauce tends to be associated with different types of dishes, particularly those that involve grilled meats or southern-style cooking. Ranch dressing is also commonly used for various dishes, such as salads or veggie platters, but it does not match the traditional flavor profile that complements calamari. Therefore, marinara sauce is the most appropriate choice for this appetizer.