Which competition is referred to by the abbreviation ADC?

The correct answer refers to the term "Architectural Design Competition." This term is widely recognized in the field of architecture as a structured event where architects and firms are invited to submit their innovative designs on specified projects or themes. Such competitions aim to generate creative solutions and elevate architectural standards.

These competitions often attract participants from diverse backgrounds and can result in groundbreaking ideas that influence future architectural practices. The term encapsulates the competitive aspect of the event, which is pivotal in fostering innovation and showcasing talent within the architectural community.

While other options may use similar terms, they do not accurately capture the essence of an organized competition designed specifically to solicit and evaluate design submissions. Hence, the use of the word "Competition" in the correct answer effectively conveys the nature of the event and aligns with professional terminology commonly used in the architectural industry.