Pteridophytes don't have seeds. They propagate by spores. · Gymnosperms are the earliest seed plants. Gymnosperms have advanced reproductive structures compared to pteridophytes. Gymnosperms produce seeds as well. Gymnosperms are the most advanced. Option D is the correct answer

Thallophyta- body not differentiated into roots and stem,no vascular system,no seed formation

Bryophyta- body differentiated but lack vascular system,no seed formation

Pteridophyta- well- differentiated body, vascular system present, no seeds formation

Gymnosperms- well-differentiated body with vascular system, seeds are naked(not enclosed in a fruit)

Angiosperms- well-differentiated body with vascular system, seeds are covered(enclosed in a fruit)