Shipwrecks are more likely to be found undisturbed at great depths than in shallow coastal 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.
than in shallow coastal waters, which exposes archaeological remains to turbulence and makes them accessible to anyone in scuba gear, whether they be
than in shallow coastal waters, where archaeological remains are exposed to turbulence and are accessible to anyone in scuba gear, whether
as opposed to shallow waters along the coast, where archaeological remains are exposed to turbulence and accessible to anyone in scuba gear, including
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
instead of shallow coastal waters, because it exposes archaeological remains to turbulence and makes them accessible to anyone in scuba gear, whether
the bad usage of 'including' with the list of singular nouns in choice c,
the bad parallelism in choice d,
the lack of referent for 'it' in choice e,
look no further than the 'which' in choice a, which is followed by the verb 'exposes'. that verb is singular, indicating that 'which' must refer to something singular - and there are no singular nouns in that part of the sentence at all.
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