First in demand during the mid-seventies, the increased purchase of energy-efficient automobiles continued as steep increases in the price of gasoline forced Americans to come to the realization that fossil fuel reserves are limited
A) First in demand during the mid-seventies, the increased purchase of energy-efficient automobiles continued
B) The increased purchase of energy-efficient automobiles, which were first in demand during the mid-seventies, continued,
C) After they were first in demand during the mid-seventies, the increased purchase of energy-efficient automobiles was continuing
D) Energy-efficient automobiles were first in demand during the mid-seventies, with the increased purchase continuing in them
E) During the mid-seventies energy-efficient automobiles were in demand, and now the increased purchase of them has continued

OA after discussion