The sun shining on a tidal pool during a hot day heats the water. As some water evaporates, the pool becomes saltier, causing which of the following?

A) a decrease in the water's oxygen content
B) a decrease in the water's density
C) an increase in the water's ability to sustain aerobic organisms
D) an increase in the water's carbon dioxide content
E) an increase in photosynthesis by the tidal pool plants