In Hungary, as in much of Eastern Europe, an overwhelming proportion of women work, many of which are in middle management and light industry.

A.    as in much of Eastern Europe, an overwhelming proportion of women work, many of which are in

B.    as with much of Eastern Europe, an overwhelming proportion of women works, many in  

C.    as in much of Eastern Europe, an overwhelming proportion of women work, many of them in  

D.    like much of Eastern Europe, an overwhelming proportion of women works, and many are  

E.     like much of Eastern Europe, an overwhelming proportion of women work, many are in

答案是C ，请问C中的many of them在句子中做什么成分啊？