What was the purpose of Operation Rolling Thunder?

What was the purpose of Operation Rolling Thunder?
 
  A) It was designed to eliminate 50 of the poverty in the United States by 1970.
  B) It was designed to use aerial bombardments to force the North Vietnamese to negotiate and stop the flow of soldiers and supplies on the Ho Chi Minh Trail.
  C) It was designed to increase literacy in the United States by 20 in the 1960s.
  D) It was designed to reduce racial tensions by rebuilding the worst urban slums.
  E) It was designed to force the Soviet Union to withdraw its forces from Eastern Europe.