How Did the United States React to the 1950 Treaty

How did the United States react to the 1950 treaty between Stalin and Mao?

A) It congratulated Stalin and Mao on their treaty and offered to join their new alliance.
B) It openly threatened Stalin with war if he contributed to the spread of communism in Asia.
C) It warned the Soviet Union to stay out of East Asian politics.
D) It wanted to keep its alliance with China and sought to make peace with the new regime.
E) It refused to recognize the new Chinese regime and focused on Japan as its main ally in Asia.