Answer:
The warm waters of the Gulf Stream have a higher rate of evaporation, which increases the salinity of the water.
I answered the question myself and got it correct.
Step-by-step explanation:
The warm Gulf Stream flows along the East Coast of the United States, so the rate of evaporation is higher. Because evaporation increases the salinity of the water, the water near the East Coast has higher salinity than the water near the West Coast.
Proof: