The Forelimbs of Manatees,penguins,seals,and Sea Turtles Are All Flipper-Shaped

The forelimbs of manatees,penguins,seals,and sea turtles are all flipper-shaped.This is an example of

A) convergent evolution to a structure permitting movement in water.
B) natural selection to a structure permitting movement in water.
C) adaptations to eating fish.
D) inheriting a common trait from a recent common ancestor.
E) selective breeding for the flipperlike forelimbs by humans.