Explanation:
A The typical wavelength of X-rays is the order of $10^{-8} \mathrm{~m}$ to $10^{-12} \mathrm{~m}$, option (a) lies between this range, therefore, since the typical wavelength of $\mathrm{X}$-rays is $10^{-10} \mathrm{~m}$.
The typical use of X-rays are in the field of medical science, astronomy, in identifying the defects in welds in industries etc.