Final answer:
Commercial carpenters are the most useful for a new hotel-shopping mall-sports arena complex due to their expertise in large-scale commercial construction, building codes, safety standards, and the diverse commercial nature of the project.
Step-by-step explanation:
The construction of a new hotel-shopping mall-sports arena complex would be a large-scale undertaking. Among the options given, the type of carpenters most useful for this project would be Commercial carpenters.
Commercial carpenters are skilled in constructing and renovating commercial buildings such as hotels, malls, and sports arenas. They bring an understanding of large-scale construction needs and are experienced in meeting commercial building codes, safety standards, and design considerations.
The project involves a combination of commercial structures, each with its specific requirements. This includes construction standards for commercial lodging (hotel), retail space (shopping mall), and large occupancy facilities (sports arena). While some aspects of this project may benefit from the detailed work typical of joiners, the overall scope and functionality of the project are best suited to the capabilities of a commercial carpenter who understands the complexities of large commercial structures.
It is also worth noting that industrial carpenters tend to work on projects related to manufacturing and heavy industry, rather than the commercial facilities being constructed in this case. Residential carpenters focus on homes and small-scale projects, making them less suitable for a complex of this magnitude and diversity in use.