GRE Logical Reading: ETS-GRE逻辑单题ETS - PQ00VH9LE4CT4G66J$

If the statements above are true, which of the following must also be true on the basis of them? A. Average fuel efficiency of domestic cars manufactured after 1988 was better than that of imported cars manufactured before 1988. B. Average fuel efficiency of newly manufactured domestic cars has steadily worsened since 1988. C. Average fuel efficiency of newly manufactured imported cars has steadily worsened since 1988. D. Average fuel efficiency of newly manufactured imported cars has steadily improved since 1983. E. Average fuel efficiency of imported cars manufactured in 1983 was better than that of imported cars manufactured in 1988.