Shared leadership, where leadership responsibilities are distributed among team members rather than centralized in a single leader, can have several disadvantages. Some groups indeed require more direction and benefit from having a central figure of authority to guide them (Option A). Additionally, in certain contexts, a central leader is necessary to help a group reach its full potential by providing vision and decisive action (Option B). Furthermore, shared leadership can sometimes lead to slower decision-making processes because it involves more individuals in the decision-making process, which can complicate consensus-building (Option C). Therefore, all of the above options are possible disadvantages of shared leadership.