The author mentions that the Ganges River dolphin species is blind and uses clicks to send

A. support the claim that an underwater acoustic device is helpful in identifying and tracking the Ganges River dolphin
B. suggest that, because of this blindness, the Ganges River dolphin survives only in rivers and lakes
C. challenge the claim that the species' decline in numbers is due to fishing net entanglement, human predation, pollution, or construction
D. refute the claim that the Ganges River dolphin can in fact be identified and tracked by underwater acoustic devices
E. lend credibility to the claim that the Ganges River dolphin is a rare species