Which system grants sovereignty solely to noncentral governments, thereby making the central government dependent on them?

The correct answer is D. Confederation system.

In a confederation system, the central government has limited powers and is heavily reliant on the member states or noncentral governments, which retain a high level of sovereignty. This contrasts with federal systems where power is shared between national and state governments. In a confederation, the central authority is dependent on the consent and cooperation of the constituent entities.