The thing that led to Benito Mussolini gaining power in Italy is A) a crisis for the national government.
The Dust Bowl.
The farmers had overfarmed their land and had lost the valuable top soil. Take into consideration a drought as well, the high winds of the plains took the overfarmed (and dry) soil and blew it across the land.
Answer:
a letter is written communications between two or more people
A group called " The New Left