An electron moves in an electric field with a kinetic energy of 2.5eV.What is the associated De-Broglie wavelength?

Question

$\begin{array}{1 1}(a)\;6.7\times 10^{-8}cm&(b)\;7.7\times 10^{-8}cm\\(c)\;7.7\times 10^{-2}cm&(d)\;6.5\times 10^{-8}cm\end{array}$