Concept:The key is the difference between a ceremonial president and an executive president with real governing powers.
Explanation:Dr. Nnamdi Azikiwe was the first President of Nigeria under the 1963 Constitution.
But his role was mostly ceremonial, while the Prime Minister held true authority.
In 1979, Nigeria introduced an executive presidency under the Second Republic.
Alhaji Shehu Shagari won that election and became the first Executive President of Nigeria.
He served from 1979 until the military coup of 1983.
Thus, the first executive president is Shehu Shagari, not Azikiwe.
Answer:D. Alhaji Shehu Shagari