Resistance to $Phytophthora$ in potato is derived from which of the following species?

  • A
    $Solanum \text{ demissum}$
  • B
    $Solanum \text{ acaule}$
  • C
    $Solanum \text{ spegazzinii}$
  • D
    $Solanum \text{ stoloniferum}$

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