Answer:
C. It ensures that the central government is strong enough to deal with major problems.
Step-by-step explanation:
One of the advantages of a unitary system of power is that most power is concentrated on the hands of the central government. This enables the central government to react successfully and effectively to crises. On the other hand, a confederate system is often more fragmented, and it has a much weaker central government. An example was the United States under the Articles of Confederation, which made the central government too weak to deal with issues as simple as taxation.