What type of seat belt extension is mentioned for the A321NX?

The correct choice identifies the Recaro seatbelt extension as the specific type mentioned for the A321NX. Recaro is a brand known for its high-quality seating solutions and is often associated with the airline industry for passenger comfort and safety features. The use of Recaro extensions in the A321NX suggests a focus on accommodating a range of body types while adhering to safety regulations. This specific brand may also imply that the seatbelt extension is designed to integrate seamlessly with Recaro seats, ensuring that they meet both comfort and safety standards.

The other types of seatbelt extensions listed, while they may exist, do not pertain specifically to the A321NX. Understanding the distinction helps emphasize how different aircraft models or seating arrangements may require specific types of equipment tailored to their design and intended passenger experience.