[求助]GWD5-Q1不明白~

自己顶一下~把题贴上来！XDJMs帮忙啊~

GWD5-Q1:

So dogged were Frances Perkins’ investigations of the garment industry, and her lobbying for wage and hour reform was persistent, Alfred E. Smith and Franklin D. Roosevelt recruited Perkins to work within the government, rather than as a social worker.

A.     and her lobbying for wage and hour reform was persistent,

B.      and lobbying for wage and hour reform was persistent, so that

C.     her lobbying for wage and hour reform persistent, that

D.     lobbying for wage and hour reform was so persistent,

E.      so persistent her lobbying for wage and hour reform, that

E.      so persistent her lobbying for wage and hour reform, that      我觉得是作为插入语对前边so dogged...的补充说明吧