Seedless vascular plants are those that have vascular system (xylem and phloem) but are unable to produce seeds.
Ferns are vascular trees which reproduce by producing spores as they do not produce seeds.
Mosses are also seedless but they do not have vascular system and hence it is not the right answer. While Juniper and rose, being vascular plant /trees on one hand also have seeds and hence they are also incorrect answer choices.
