Concept:Red-tape refers to excessive bureaucratic rules and delays in decision-making. Its absence means faster and more efficient administration.Explanation:A unitary system concentrates power in a single central government. It has fewer administrative layers and does not require approval from multiple levels. In contrast, a federal structure has central, state, and local governments, while a confederal structure relies on autonomous units. These levels slow down processes and encourage red-tape. Because decisions flow directly from one authority in a unitary system, procedures are simpler and quicker. Therefore, freedom from time-consuming regulations is a recognised advantage of operating a unitary structure.Answer:B. unitary structure