What Evidence Supports the Hypothesis That Marine Bony Fish Evolved

What evidence supports the hypothesis that marine bony fish evolved from freshwater ancestors?

A) They are osmotic regulators and have physiologic mechanisms for maintaining blood plasma osmolarity.
B) They have kidneys that help regulate the osmolarity of their blood plasma.
C) Their gills are able to move water by osmosis out of their bodies.
D) Their gills are able to carry out active transport of salt from their bodies.
E) Their body fluids are much less concentrated than seawater.