Final answer:
The correct label for vascular bundles neatly arranged around the stem is E for eudicot. In eudicots, vascular tissue forms a ring in the stem, unlike in monocots where it is scattered.
Step-by-step explanation:
For the characteristic of vascular bundles being neatly and uniformly arranged around the stem, the correct labeling is E for eudicot. In eudicots, also known as true dicots, the vascular tissue, which includes both xylem and phloem, forms a ring in the stem.
This is in contrast to monocots, where vascular tissue is scattered in the stem without a uniform arrangement. An example of this arrangement is the clover stem, a eudicot, that shows vascular bundles organized in a ring with a large central pith.