Hardening in tissue culture is

  • A
    Keeping $30^{\circ}-50^{\circ} C$ temperature for about $30$ minutes
  • B
    Acclimatization of tissue culture plants slowly before growing in the field
  • C
    Plunging the vials into water at $37^{\circ}-40^{\circ} C$
  • D
    None of the above

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