Which statement best explains why scientists depend on submarines to study
ocean features?

A The vastness of the ocean environment makes it difficult for any single ship to
collect enough data to produce accurate maps.

B The greater salinity of surface waters corrodes metals used to construct ocean
vessels.

C The extreme pressure and freezing temperatures of the deep ocean make it
dangerous to send humans to the greatest ocean depths.

D Signals used to collect remote sensing data cannot travel through ocean water.