$A.$ Mycoplasma, the smallest cells, are only $0.3 \mu m$ in length.
$B.$ Size of bacteria could be $3$ to $5 \mu m$.
$C.$ Human red blood cells are about $7.0 \mu m$ in radius.

  • A
    Only $A$ is correct
  • B
    Only $B$ is correct
  • C
    Only $C$ is incorrect
  • D
    Only $C$ is correct

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