a. than in shallow coastal waters, which express archaeological remains to turbulence and makes them accessible to anyone in scuba gear, whether they be
"which express archaelogical" is incorect. "whether they be" is redundant . "whether" is sufficient.
b. than in shallow coastal waters, where archaeological remains are exposed to turbulence and are accessible to anyone in scuba gear, whether
-CORRECT
c. as opposed to shallow waters along the coast, where archaeological remains are exposed to turbulence and accessible to anyone in scuba gear, including
wrong contrast."shallow waters along with coast" is contrasted. probably "including" is incorrect as it says including x, y or z . It should be including x, y and z.
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
"which" implies coast, and not the shallow waters , exposes the archaeological means.
e. instead of shallow coastal waters, because it exposes archaeological remains to turbulence and makes them accessible to anyone in scuba gear, whether
wrong contrast as in C.
B seems to be the best.