[求助]新prep1-249

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NN帮个忙，为什么A不正确呢？women后面有动词，which就不能指代women么？
还有many of which和many of them，我一直没明白它们的使用方法，请NN指教！