Fundjuhl总结的GMATprep语法题一道（有她/他的解释），比来比去，我也只有选B。但是根据白勇语法，不是只有once和whenever可以直接跟名词吗？请哪位朋友帮忙解释一下，谢谢
21. Shipwrecks are more likely to be found undisturbed at great depths than in shallow costal waters, which exposes archaeological remains to turbulence and makes them accessible to anyone in scuba gear, whether they be
archaeologist, treasure hunter, or sport diver. A. than in shallow costal waters, which exposes archaeological remains to turbulence and makes them accessible to anyone in scuba gear, whether they be B. than in shallow costal waters, where archaeological remains are exposed to turbulence and are accessible to anyone in scuba gear, whether
C. as opposed to shallow waters along the coast, where archaeological remains are exposed to turbulence and accessible to anyone in scuba gear, including D. instead of in shallow waters along the coast, which exposes archaeological remains to turbulence and making them accessible to anyone in scuba gear, including an E. instead of shallow coastal waters, because it exposes archaeological remains to turbulence and make them accessible to anyone in scuba gear, whether | 
