Answer:
The correct answer is A. to strengthen national security
Explanation:
A is correct answer because Federalist were afraid that war with France was imminent and that many immigrants have plotted against United States. That is why this Acts were brought to control the immigration among other things.
B is also correct, but doesn't fully support the main idea of the Acts. They wanted to control the immigration, but their main goal was to preserve the strength of Federalists.
C is also partially correct, but economy was not the main topic of the Acts.
D is totally false, because certain changes were imposed when it comes to immigration.