The correct option is A Non-flowering plants
Thallophyta, Bryophyta and Pteridophyta are called non-flowering plants because they do not produce any flowers.
Thallophyta includes the algae, bacteria, fungi and lichens.Example: Spirogyra
Bryophytes do not have well-differentiated roots, stems and leaves.Example: Moss
Pteridophytes are vascular plants and have leaves, roots and sometimes true stems.Example: Fern