Ocean Water Is Much Saltier Than a Fish's Cells,so the Animal

Ocean water is much saltier than a fish's cells,so the animal loses water by osmosis,mostly at the gills.How would a saltwater fish osmoregulate?

A) Drink seawater and use active transport at the gills to take up salt from the water.
B) Produce dilute urine and use active transport at the gills to take up salt from the water.
C) Drink seawater and use active transport at the gills to get rid of excess salts.
D) Produce dilute urine and use active transport at the gills to get rid of excess salt from the water.