644. Since 1975 the number of women in upper-level management in American corporations have increased by 25 percent; female executives' salaries, however, still lag behind those of their male counterparts.
(A) have increased by 25 percent; female executives' salaries, however, still lag
(B) has increased by 25 percent, however much their salaries lag
(C) have increased 25 percent; female executives' salaries, however, still have lagged
(D) has increased by 25 percent; female executives' salaries, however, still lag
(E) have increased 25 percent; their salaries, however, still lag