Identify the labels $P$,$Q$,and $R$ in the given cross-section of a leaf.

  • A
    $P$: Xylem,$Q$: Phloem,$R$: Epidermal cell
  • B
    $P$: Xylem,$Q$: Phloem,$R$: Guard cell
  • C
    $P$: Phloem,$Q$: Xylem,$R$: Guard cell
  • D
    $P$: Phloem,$Q$: Xylem,$R$: Epidermal cell

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