The plant group which is considered as the oldest on Earth is Ferns. Thus the correct option is B.
What are Ferns?
Ferns are a type of plant that does not produce blossoms. In most cases, ferns reproduce by generating spores. Plant supply food, pesticides, and decoration and are utilized in Homoeopathic, Ayurvedic, Tribal, and Unani treatments.
Ferns can be found in both humid climates and temperate climates. Some ferns can also survive in sub-arctic temperatures. A spore is the plant's body of the Fern. It is divided into three parts: the real stem, leaves, and roots.
Therefore, option B Ferns is the appropriate answer.
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