大全 885 Section16 No.20 没有讨论--求助

请问下题的C为什么错？ 谢谢！

57．             Added to the increase in hourly wages requested last July, the railroad employees are now seeking an expanded program of retirement benefits.

(A) Added to the increase in hourly wages requested last July, the railroad employees are now seeking an expanded program of retirement benefits.[过去分词引导的前置结构与句子逻辑主语不一致]

(B) Added to the increase in hourly wages which had been requested last July, the employees of the railroad are now seeking an expanded program of retirement benefits. .[过去分词引导的前置结构与句子逻辑主语不一致]

(C) The railroad employees are now seeking an expanded program of retirement benefits added to the increase in hourly wages that were requested last July.[不是十分清楚C选项的排除原因，但是that引导的从句修饰wages不简洁；added to the increase 可能有错，不如in addition to的表达更符合语法习惯？？？]

(D) In addition to the increase in hourly wages that were requested last July, the railroad employees are now seeking an expanded program of retirement benefits.（E）[定语从句引导的修饰成分不如E选项的过去分词引导成分修饰名次来得简洁]

(E) In addition to the increase in hourly wages requested last July, the employees of the railroad are now seeking an expanded program of retirement benefits.

1.
            Added  and increase are redundant

2,that were is wordy

3.added to the increase in hourly wages that were requested last July.should modify subject,but here modify retirement benefits