Which of the following is true regarding the transport of $CO_2$ by red blood cells $(RBCs)$ in humans?

  • A
    They do not transport $CO_2$.
  • B
    They transport approximately $20-25\%$ of $CO_2$.
  • C
    They transport $99.5\%$ of $O_2$.
  • D
    They transport $80\%$ of $O_2$ and the remaining $20\%$ is transported by plasma.

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