Which Policy Did Lyndon Johnson Follow with Regard to American

Which policy did Lyndon Johnson follow with regard to American involvement in Vietnam?

A) He followed an attrition strategy to try to force the communist to the peace table.
B) He rapidly increased the number of American ground troops in South Vietnam for a massive invasion of North Vietnam
C) He gradually withdrew American forces while asking for United Nations mediation.
D) He pulled American forces out immediately and declared that the United States had achieved its goals.
E) It did nothing until free elections could be held in South Vietnam.