What type of plant produces seeds that are exposed rather than seeds enclosed in fruits?

The correct answer is Gymnosperms, which are a group of seed-producing plants characterized by having seeds that are not enclosed within an ovary or fruit. Instead, gymnosperms typically produce seeds on the surface of cones or other structures. This means that their seeds are exposed to the environment, which is a defining characteristic of this group.

In contrast, Angiosperms, which are the flowering plants, have seeds that are enclosed within fruits. Ferns and mosses are non-seed plants and reproduce through spores rather than seeds. Therefore, the distinctive feature of gymnosperms—having naked seeds—clearly sets them apart from the other types of plant groups listed in the question.