Which of the following statements is $correct$?

  • A
    Stems are usually unbranched in both $Cycas$ and $Cedrus$.
  • B
    $Selaginella$ is heterosporous, while $Salvinia$ is homosporous.
  • C
    Horsetails are gymnosperms.
  • D
    Ovules are not enclosed by ovary wall in gymnosperms.

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