D.theory.
Hypothesis is an idea or explanation of something that is based on a few know facts but that has not yet been proved to be true or correct.
While a theory is a formal set of ideas that is intended to explain why something happens or exists.
Answer:
http://etetoolkit.org/treeview/?treeid=e29a1e3f1e8914f370f5bb2415bbcf32&algid=ce443ed1e53858bf4e11d1e069c7a927
You can view the tree by clicking view tree...
Explanation:
I think that the Ctenophora are the first to diverge from the origin then Calcerea goes for second divergence and it goes straight in the order as provided by your data.
It also shows the organization of evolutionary pathway from simple (Ctenophorea and Calcerea) to complex like mammals (African Elephant)...
