The two maps show the salinity and current flows in the Atlantic and Pacific Oceans. Which sentence correctly explains the difference in salinity in the oceans along the East Coast and the West Coast of the United States?

a. The warm waters of the Gulf Stream have a higher rate of evaporation, which increases the salinity of the water.
b. Precipitation near the Gulf Stream increases the salinity of the water in that area.
c. Melting ice in the Gulf Stream increases the salinity of the water in that area.
d. Melting ice in the Labrador Stream increases the salinity of the water in that area.