Final answer:
Underwater archaeologists employ a dredge to remove sediments from the ocean floor, enabling them to reveal artifacts and structures for study. The correct answer is option b
Step-by-step explanation:
Underwater archaeologists use a b. dredge to suck the seafloor sediments like a giant vacuum. A dredge is an apparatus often operated by divers or remotely controlled machinery that removes sediments and debris from the ocean floor during excavation processes. This method allows archaeologists to clear away sediment and uncover artifacts or areas of interest without the need for manual digging, which can be incredibly time-consuming and difficult in an underwater environment.