The ratio of radii of first orbits of H, `He^(+)` and `Li^(2+)` is:

The ratio of radii of first orbits of H, `He^(+)` and `Li^(2+)` is:
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The ratio of radii of first orbits of H, `He^(+)` and `Li^(2+)` is: A. `1 : 2 : 3` B. `6 : 3 : 2` C. `1 : 4 : 9` D. `9 : 4 : 1`
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