Answer:
Option C, SPECIALIZATION
Explanation:
Formalization in an organizational structure is a process in which managers specify (in writing), procedure, rules and responsibilities for the individual employees, organizational units, groups and others which leads to the development of processes and operating procedures.
Centralization refers to the process in which activities involving planning and decision making within an organization are concentrated to a specific leader or location (head office).
Specialization, which is sometimes called division of labour, refers to the degree to which an organization divides individual tasks into separate jobs.
Standardization is the process by which a company makes it methods, especially its production processes, uniform throughout it's organization.
*Specialization allows a manager to complex tasks and break them into smaller and more precise tasks that individual can complete.
Therefore, the division of management responsibilities described in the question is an example of SPECIALIZATION.