The figure shows blood circulation in humans with labels $A$ to $D.$ Select the option that correctly identifies the label and the functions of the part.

  • A
    $A-$ Artery: Thick-walled,blood flows under high pressure.
  • B
    $B-$ Capillary: Thin-walled,single-cell layer thick,site of exchange.
  • C
    $C-$ Vein: Thin-walled,contains valves,blood flows at low pressure.
  • D
    $D-$ Pulmonary vein: Carries oxygenated blood to the heart,$PO_2 = 95 \, mm \, Hg$.

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