请教 Prep-1 249 的解释

249. (GWD-10-Q36)(GWD-11-19)
In Hungary, as inmuch of Eastern Europe, an overwhelming proportion of women work, many of whichare in middle management and light industry.
A.as in much of EasternEurope, an overwhelming proportion of women work, many of which are in
B.as with much of EasternEurope, an overwhelming proportion of women works, many in
C.as in much of EasternEurope, an overwhelming proportion of women work, many of them in
D.like much of EasternEurope, an overwhelming proportion of women works, and many are  
E.like much of EasternEurope, an overwhelming proportion of women work, many are in


这里many of them是同位语还是独立主格呢？ Prep上说是同位语 我有些困惑 可以理解为独立主格吗？
C.    correct；them指代women，同位语后置 (可以理解为独立主格吗？)；这里的as的比较对象平行。