OG11-28 in reference to --- referreing to短语有区别吗？ 另外不知道我这个版本的OG11讨论稿在哪里可以搜到？

28. In reference to the current hostility toward smoking smokers frequently expressed anxiety that their prospects for being hired and promoted are being stunted by their habit．

(A)  In reference to the current hostility toward smoking，smokers frequently expressed anxiety that

(B)  Referring to the current hostility toward smoking，smokers frequently expressed anxiety about

(C)  When referring to the current hostility toward smoking，smokers frequently express anxiety about

(D)  With reference to the current hostility toward smoking，smokers frequently expressed anxiety about

(E)  Referring to the current hostility toward smoking，smokers frequently express anxiety that

请问这里的词组In reference to    Referring to  功能是一样的吧? 都表示什么意思呀？

多谢指点？