I believe that the answer is A i could be wrong though.
The range in size of most atomic radii is approximately <span>5 × 10−21 m to 2 × 10−20 m. The rest of the choices do not answer the question above.</span>
As we go farther from the nucleus, the energy of orbitals increase. Also, the farther an electron is from the nucleus, the more repulsion it has to face because of other electrons(more screening effect) and hence it is easier to remove that electron.so n=1 which is very close to the nucleus has least energy and n=7 which is far away from nucleus has higher orbital energies.
It will make you have headache and let you sleep entire hour maybe?