Concept:Nationalism in Nigeria was encouraged by internal grievances, especially the disappointment of African soldiers after World War II.
Explanation:Many Nigerians served alongside Britain in World War II.
They were promised jobs and better treatment after the war.
On return, these ex-service men did not receive the promised rewards.
This disappointment created anger and a desire to challenge colonial rule.
Therefore, the return of ex-service men acted as an internal factor that stimulated nationalist movements.
Answer:B. return of ex-service men