A. The value of a shipwreck depends on the quantity of its artifacts.
B. Preservationists are fighting the use of technological advances such as side-scan sohar.
C. Side-scan sohar has helped to legitimize salvaging.
D. The use of sound waves is crucial to locating shipwrecks.
Đáp án là C. Dựa vào ý: The search party, using side-scan sohar, a device that projects sound waves across the ocean bottom and produces a profile of the sea floor, located the wreck in just two and a half days.
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