Dittmar Analyzed Approximately Seventy Seawater Samples Collected Around the World

Dittmar analyzed approximately seventy seawater samples collected around the world during the Challenger Expedition. He concluded that

A) seawater had the same salinity worldwide.
B) salt content changes due to processes that add or subtract salt.
C) the major ions were always present in the same ratios.
D) dissolved gases are always present in the same ratios.
E) the major ions were always present in the same ratios and dissolved gases are always present in the same ratios.