The Invasion of the Land by Amphibians Posed a Number

The invasion of the land by amphibians posed a number of challenges requiring evolutionary innovations.Which one of the following does NOT match a challenge with a corresponding adaptation found in amphibians?

A) The force of gravity was greater without water's buoying effect,selecting for well-muscled legs.
B) Additional oxygen was needed for larger muscles,selecting for the partially-divided heart and pulmonary circuit.
C) Eggs dry out in a terrestrial environment,selecting for the amniotic egg.
D) Gills tend to collapse out of the water,selecting for lungs and cutaneous respiration.