Answer:
C. It represents a new relationship with China.
Step-by-step explanation:
Nixon ended years of diplomatic isolation by China, that started in 1949 when the communists took over mainland China and forced the chinese nationalists fled to Taiwan who was allied to the United States, in 1972 with a diplomatic visit to the asian country.
This marked a new era of diplomatic relationships between the United States and China, this was also important because the cold war era balanced changed since China was allied with the USSR and after Nixon´s visit they weren´t happy with the chinese government actions.