People can express themselves freely as long as they do not ____________ the rights of others.

The correct answer focuses on the principle that while individuals have the right to express themselves, this freedom comes with the responsibility to respect the rights of others. The term "abuse" in this context implies that expression should not infringe upon or harm the rights of other individuals.

Freedom of expression is a fundamental right protected by the First Amendment of the Constitution, but this right is not absolute. It is generally accepted that free expression may be restricted when it violates the rights and freedoms of others. For example, hate speech or incitement to violence can abuse the rights of others, which is why measures exist to limit such expressions to maintain a balance between individual liberties and societal order.

In contrast, other options like "enhance," "ignore," and "limit" do not adequately reflect this balance. Enhancing the rights of others is not a relevant consideration in the context of expression, ignoring the rights of others suggests negligence rather than a direct infringement, and limiting the rights could suggest that expression itself is being curtailed rather than emphasizing the respect for others’ rights. Thus, the concept of "abuse" captures the essential idea that freedom of expression must coexist with the obligation not to harm or violate the rights of others.