Concept:Decree 34 of 1966 changed Nigeria from a federal to a unitary system.Explanation:General Ironsi issued Decree 34 in 1966.The decree abolished the federal structure of government.It replaced it with a unitary system of government.Many Nigerians rejected this because it removed regional autonomy.They saw it as a direct attack on the federal system that held the country together.Answer:B. perceived to abolish the federal system.