Which of the following was Nixon able to negotiate as a result of his new relationship with China?

Nixon's new relationship with China, marked by his historic visit in 1972 and the subsequent improvement of diplomatic ties, significantly transformed the geopolitical landscape. While his engagement with China did ultimately lead to various negotiations and impacts on foreign relations, particularly concerning the Soviet Union, the actual negotiation that directly stemmed from his relationship with China was the "normalization of trade relations."

This approach not only opened channels for economic exchanges but also paved the way for a more substantial diplomatic presence and engagement with a country that was previously isolated from Western economies. The resultant benefits for both nations included increased trade, cultural exchanges, and a strategic partnership that would affect global politics, particularly during the later years of the Cold War.

Although other options like the end of the Vietnam War and the freeze on missiles hint at broader implications of Nixon's foreign policy, they did not directly result from his engagement with China. The normalization of trade relations directly illustrates how his diplomatic approach altered the economic dynamics between the U.S. and China.