Deconcentration involves the passing down of selected administrative functions to lower levels or units within government agencies or departments with the centre remaining in control
Like the series of political office arrangements and portfolios in the Hausa/Fulani Empire i.e the Galadima, Waziri and the rest, deconcentration of power is obtainable unlike in devolution which Options B and D implicitly cover. Option A refers to the Decentralization of powers.