According to FIA Act, the administration of the FIA shall vest in the

(A) Federal Government
(B) President
(C) Prime Minister
(D) Director-General

The answer is: (D) Director-General
According to the FIA Act 1974, the administration of the Federal Investigation Agency (FIA) shall vest in the Director General who shall exercise the powers for the agency as an Inspector General of Police under the Police Act, 1861.