Though widely used for decades to fuel home heating systems, utility boilers, and industrial furnaces, natural gas has still accounted for far less of the energy consumed in the United States than has oil.

(A) natural gas has still accounted for far less of the energy consumed in the United States than has oil

(B) natural gas has still accounted for far less of the energy consumed in the United States as oil

(C) natural gas still has accounted for far less of the energy consumed in the United States as oil has

(D) still far less of the energy consumed in the United States has been accounted for by natural gas as by oil

(E) still far less of the energy consumed in the United States has been accounted for by natural gas than has oil