A Friend Who Is Not a Biologist Tells You That

A friend who is not a biologist tells you that she grows irises from iris roots.You explain to her that the "root" she is planting is not a root,but instead is called a rhizome."Why?" she asked.You explain:

A) "A root grows vertically,not horizontally."
B) "A rhizome has nodes and internodes and is really a modified stem that can exist underground."
C) "A root stores nutrients,but rhizomes are underground stems that do not store nutrients."
D) "A rhizome,although a modified stem,acts as a root does.In other words a rhizome is a stem-root combination."
E) "A rhizome is a modified root that is able to grow leaves."