Human and Fish Embryos Share a Number of Features

Multiple Choice

Human and fish embryos share a number of features. Why is this?

A) Humans and fish share a common ancestor.
B) Embryos of all organisms, plant and animal, look alike.
C) Mutations in human and fish embryos have caused them to look alike.
D) Humans and fish have exactly the same genes, but as they develop, different genes are turned on in fish than in humans.