How Does an Evolutionary Tree Provide Evidence of Speciation, or the Idea

How does an evolutionary tree provide evidence of speciation, or the idea that one species arises from another?

A) The tree's branches are interconnected and organized with one branching from the next, and there are fewer branches as you move back in time.
B) Evolutionary trees are pretty much made up by scientists so they don't really provide evidence of anything.
C) The DNA on the branches changes in a consistent manner over time, suggesting constant change.
D) The tree represents generations just like a human family tree.
E) Organisms lower on the tree branches clearly evolved from organisms higher on the tree branches.