A proton has kinetic energy E = 100 keV which is equal to that of a photon. The wavelength of photon is `lamda_(2)` and that of proton is `lamda_(1)`. The ratio of `lamda_(2)//lamda_(1)` is proportional to
A. `E^(2)`
B. `E^(1//2)`
C. `E^(-1)`
D. `E^(-1//2)`
