The Johnson Administration Chose to "Americanize" the War in Vietnam

The Johnson administration chose to "Americanize" the war in Vietnam despite the fact that Democratic leaders in the Senate, some administration officials, and many of America's allies had misgivings. Why?

A) Intelligence indicated that China would immediately invade Vietnam if American forces withdrew.
B) Japanese leaders expressed fears of instability and disorder throughout Southeast Asia if the United States failed to defend South Vietnam.
C) Johnson believed that "Americanizing" the war was the first step in convincing the United Nations to send a multinational peacekeeping force to Vietnam.
D) The administration believed that America's credibility was at stake.