Concept:The Second Republic in Nigeria lasted from 1979 to 1983, and its opposition leader was the head of the main opposition party.
Explanation:During the Second Republic, the ruling party was the National Party of Nigeria (NPN), led by President Shehu Shagari.
The leader of the opposition was Chief Obafemi Awolowo.
He led the Unity Party of Nigeria (UPN), which was the principal opposition party in the National Assembly.
Awolowo contested the 1979 and 1983 presidential elections under the UPN but lost to Shagari.
Therefore, among the given names, the correct leader of the opposition is Obafemi Awolowo.
Answer:C. Obafemi Awolowo