Answer: b. voter apathy
Explanation:
Voter apathy poses a threat to American democracy because if a lot of people who have the right to vote do not vote then democracy is not guaranteed.
Voter apathy refers to when a lot of people who have the right to vote do not vote or when there is a low turnout among eligible voters in jurisdictions where voting is optional or compulsory.
Democracy is a system of government in which the people exercise their right by voting for leaders or representatives in an election. The leaders are held accountable for policies and conduct in office.