b) Duong Van Minh
Duong Van Minh was the general who led the overthrow of Diem and was rewarded with leadership.
A Buddhist leader took the leadership position of Premier but real government power fell to Minh was a military leader. The new government received US approval if they promised to maintain a democratic government and not a dictatorship. Minh would later be overthrown because he could not create stability in the South Vietnamese government.