Concept:The restructuring of the Supreme Military Council (SMC) by General Murtala Muhammed removed military governors from its membership.
Explanation:General Murtala Muhammed came to power in 1975, replacing General Yakubu Gowon as the Head of State.
Under Gowon's regime, the military governors of the states served as members of the Supreme Military Council.
Murtala Muhammed changed this arrangement when he created his own SMC.
He deliberately excluded the military governors from the council.
Instead, the governors were expected to implement and administer federal policies within their states without sitting on the council.
Therefore, the removal of military governors from the SMC was a unique feature of Murtala Muhammed's council when compared with Gowon's council.
Options A, C, and D do not describe this distinctive structural change.
Answer:B. exclusion of military governors from the council