What was a notable action taken by the U.S. concerning human rights in China?

The notable action taken by the U.S. concerning human rights in China is the condemnation of the unlawful killings of students, particularly referring to the Tiananmen Square Massacre in 1989. Following this tragic event, where the Chinese government used military force against pro-democracy protesters, the U.S. government expressed its disapproval and outrage over the violent repression. This condemnation highlighted the U.S. commitment to advocating for human rights and democratic principles, as it called attention to the brutal actions of the Chinese authorities against their own citizens who were peacefully protesting.

In contrast, the other options do not capture the specific human rights stance of the U.S. in this context. Improving trade relations and increasing travel opportunities could be seen as more pragmatic, economic-based actions that do not directly address human rights violations. Supporting the Chinese government would contradict the core values of promoting human rights, especially in the face of such blatant abuses. Thus, the stance taken by the U.S. in condemning the killings reflects a significant moment in its foreign policy regarding human rights in China.