Which best explains why the relationship between US and China improved toward the end of the 20th century?

The relationship between the US and China improved toward the end of the 20th century primarily due to China's economic reforms and opening up under Deng Xiaoping, which aimed to integrate the country into the global economy. The US recognized the potential for trade and investment opportunities in China, leading to increased economic engagement. Additionally, geopolitical considerations, such as the need to counterbalance the influence of the Soviet Union, encouraged cooperation between the two nations. This culminated in China's accession to the World Trade Organization in 2001, further solidifying their economic ties.