Step 1: Understanding the terms.
In dictyostele, the vascular bundles are arranged in such a way that they have both xylem and phloem tissues arranged in a circular manner. In dictyostele, the vascular bundles are amphivasal. This means that the xylem is located in the center and phloem is located at the periphery.
Step 2: Conclusion.
The correct answer is (4) Amphivasal bundles.