The de Broglie wavelength of an electron is \(0.4 \times 10^{10} \mathrm{~m}\) when its kinetic energy is \(1.0 \mathrm{keV}\). Its wavelength will be \(1.0 \times 10^{-10} \mathrm{~m}\), when its kinetic energy is
(A) \(0.2 \mathrm{keV}\)
(B) \(0.8 \mathrm{keV}\)
(C) \(0.63 \mathrm{keV}\)
(D) \(0.16 \mathrm{keV}\)