Which body must approve specific regulations for club competitions within a Zone?

The correct answer is the FIBA Central Board, as this body is responsible for overseeing and approving specific regulations that govern club competitions within a particular Zone. The Central Board plays a crucial role in ensuring that all aspects of the game, including how competitions are structured and conducted at the club level, are aligned with FIBA's overall governance and standards.

The FIBA Central Committee serves in an influential capacity but focuses more on the broader governance and strategic direction of basketball globally. The International Basketball Federation is the overarching organization that encompasses all international basketball matters, but it is the Central Board that specifically handles the intricacies and details of club competitions at the zonal level. The National Basketball Association, while significant in the realm of professional basketball, operates independently and does not have authority over FIBA’s regulatory frameworks.