Answer :
An aggressive act by the Italians in the lead up to World War II was B. The invasion and conquest of Ethiopia in Africa.
What did the Italians do in Ethiopia?
Mussolini, the Italian leader, wanted to show that his nation was strong and so decided to conquer the nation of Abyssinia (Ethiopia).
With modern weapons and tactics, his armies invaded Ethiopia and conquered it easily but this led to sanctions from other European nations in the League of Nations.
In conclusion, option B is correct.
Find out more on the Italian Invasion of Ethiopia at https://brainly.com/question/867008.