Why does $RNA$ not act as a genetic material?

• A
  The presence of a $2'-OH$ group on every nucleotide of $RNA$ makes it unstable and prone to degradation.
• B
  Since $RNA$ can act as a catalyst (ribozyme),it is more reactive and structurally unstable.
• C
  The presence of uracil instead of thymine in $RNA$ makes it less stable.
• D
  All of the above.