For what kinetic energy of a neutron will the associated de-Broglie wave length be $1.40 \times 10^{-10}\;m$ given : $h= 6.63 \times 10^{-34}\;Js,m_n= 1.675 \times 10^{-27}\;kg; k= 1.8 \times 10^{-23}JK^{-1}$

Question

$\begin{array}{1 1} 6.634 \times 10^{21}\;J \\ 6.634 \times 10^{-21}\;J \\ 6.634 \times 10^{23}\;J \\ 6.634 \times 10^{-23}J \end{array}$