Answer:
B. Europe
Explanation:
On the graph, you can see that after 1870-1919, Europe's immigration basically goes downhill. In that case, Europe received a very major decline in immigration, making it the right answer. Apologies if I'm wrong.
The correct answer is the Suez Canal in Egypt.
The others are in different continents: The Grand Canal in Europe (Venice), the Panama Canal in the Americas ( and splits the two Americas) and Erie Canal is in America (NY).
D. -----> Spread Catholicism.........