Select the correct option:
$(1)$ Approximately $97\%$ of $O_2$ is transported by plasma / RBCs.
$(2)$ The primary site of gas exchange is alveoli / bronchioles.

  • A
    $(1)$ Plasma,$(2)$ Alveoli
  • B
    $(1)$ RBCs,$(2)$ Alveoli
  • C
    $(1)$ Plasma,$(2)$ Bronchioles
  • D
    $(1)$ RBCs,$(2)$ Bronchioles

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