Philippe Bouchet and colleagues conducted a massive survey of marine molluscs on the west coast of New Caledonia.Twenty percent of the species found were represented by a single specimen.What does that suggest about the diversity of molluscs in this area?

A)The west coast of New Caledonia is not an appropriate habitat for molluscs.
B)Many of the species from this 20 percent are probably rare.
C)They were not sampling uniformly throughout the area.
D)Many of the species from this 20 percent are most likely just dispersing through the area.