Concept:The Nigerian Civil War is directly linked to the military Head of State who was in power when the war was fought.
Explanation:The Nigerian Civil War lasted from 1967 to 1970.
It was fought between the Federal Government of Nigeria and Biafra, the secessionist Eastern Region.
During this period, General Yakubu Gowon was the military Head of State.
He came into power in 1966 and ruled until 1975.
Thus, the civil war occurred entirely under his military regime.
Aguiyi Ironsi ruled briefly in 1966, before the war started.
Murtala Muhammed and Olusegun Obasanjo led Nigeria only after the war had ended, from 1975 onward.
Answer:B. Yakubu Gowon