If Water Passed Over the Gills of Fish in the Same

If water passed over the gills of fish in the same direction as blood flows through the capillaries in lamellae, how would gas exchange be affected?

A) More oxygen would diffuse from the water into the fish's bloodstream.
B) Less oxygen would diffuse from the water into the fish's bloodstream.
C) More carbon dioxide would diffuse out of the fish's bloodstream into the water.
D) Less carbon dioxide would diffuse out of the fish's bloodstream into the water.
E) Gas exchange would remain the same, regardless of the direction of water flow.