Final answer:
The appropriate ratio of the diameters cannot be determined from the given information.
Step-by-step explanation:
The appropriate ratio of the diameter of the red blood cell to the diameter of the chickenpox virus can be determined by comparing the sizes of both. A human red blood cell has a diameter of approximately 8 micrometers (8 μm) while the size of a chickenpox virus is not provided in the given information. Therefore, we cannot calculate the exact ratio. None of the options given in the question provide a suitable ratio.