Why,despite $1 Billion in Aid and Seven Hundred U

Why,despite $1 billion in aid and seven hundred U.S.military advisers committed by the Eisenhower administration,was the situation in South Vietnam still so unstable when President Kennedy took office?

A) The South Vietnamese government and army were ineffective,and their corruption and repression alienated their own countrymen.
B) The U.S.Congress was not behind the effort and refused to commit combat troops to the region to finish the job.
C) The Green Berets in South Vietnam had not been trained in guerrilla warfare and could not respond to it.
D) Leaders of the South Vietnamese army were Communist sympathizers who had no desire to oust the Vietcong.