Which aircraft designed by Airbus competes with the Boeing 787 as its first composite carbon fiber aircraft?

The A350 is the correct choice as it is Airbus's first aircraft to utilize a significant amount of composite carbon fiber materials in its structure, comparable to the Boeing 787. By incorporating composite materials, the A350 benefits from weight reduction, improved fuel efficiency, and enhanced aerodynamics, all of which are crucial competitive advantages in the modern aviation market.

The A380, while also a notable Airbus aircraft, is primarily made of aluminum with some composite components, and it is designed for very large passenger capacities rather than direct competition with the 787. The A320 and A330, while successful models, do not utilize the same level of composite materials and are based on older designs. The introduction of the A350 marked a significant advancement in Airbus's technology and manufacturing capabilities in the composites arena, positioning it directly against the Boeing 787 in the market for modern, long-range, fuel-efficient aircraft.