A) Progymnosperms, Seed ferns, Psilophyton, Gnetales, Cycads
B) Psilophyton, Progymnosperms, Seed ferns, Cycads, Gnetales
C) Psilophyton, Seed ferns, Progymnosperms, Gnetales, Cycads
D) Psilophyton, Progymnosperms, Cycads, Seed ferns Gnetales
Correct Answer: B
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