Answer:
Civil engineering.
Step-by-step explanation:
Civil engineering is a branch of engineering whose mission is the design and construction of structures and buildings for civil use, understood as the use of these structures by society in the context of their daily life. Thus, for example, this branch of engineering is responsible for the construction of bridges, dams, tunnels, etc., being in all cases structures that facilitate the normal development of life in society.
In this context, the design and construction of a new sports arena, as long as it meets these parameters, would be carried out by a civil engineer.