Which of these topics is appropriately narrowed for student research?
A. a history of U.S. immigration
B. causes of the current U.S. immigration crisis
C. the U.S. as a nation of immigrants
D. how naturalization happens
Although this depends greatly on the project and student in question, the best option from the list would be "D. how naturalization happens," since it is the narrowest and most manageable of the topics.