Answer:
B. It was used by Italian leaders to continue to fuel nationalism.
Step-by-step explanation:
Irredentism is a political or social movement that wants to reclaim a land considered lost in the past.
In Italy, this movement was efficient because of the former greatness of the Roman Empire. It was used by the dictator Benito Mussolini to entered in World War II on behalf of Adolf Hitler and conquered several regions in Europe and Africa.
I hope this answer helps you.