The probable audience for an argumentative paragraph can vary depending on the topic and the arguments presented. However, based on the options you’ve provided:
The American Library Association (ALA): If the argumentative paragraph is about library policies, intellectual freedom, literacy, or other topics related to libraries and librarianship, then ALA could be a probable audience.
American citizens and voters: If the argumentative paragraph is about a political issue, public policy, or anything that might affect the rights and duties of American citizens or influence their voting decisions, then American citizens and voters could be a probable audience.
Chinese ambassadors: If the argumentative paragraph is about Sino-American relations, international diplomacy, or issues that directly concern China’s interests, then Chinese ambassadors could be a probable audience.
Without knowing the content of the argumentative paragraph, I can't really give you a good answer, sorry :(