The correct answer is:
a. the act made it harder for Democratic-Republican supporters, like immigrants, to vote.
The Federalists supported the Alien and Sedition Acts mainly because they believed it would help safeguard the nation from perceived threats, particularly from immigrants who were often more likely to support the Democratic-Republicans. The acts included measures that made it more difficult for immigrants to become citizens and thus vote. Additionally, the Sedition Act specifically targeted individuals who criticized the government or its officials, which also aligned with Federalist interests in suppressing opposition.