Given $m(_{86} R_n ^{220} =220.1137\;u; m(_{84}Po^{216})=216.00189u$ and $m_{\alpha}=4.00260 \;u$ Find the Q value and K.E of the emitted $ \alpha$ particle in the $\alpha$ decay of $_{86} Rn ^{220}$

Question

$\begin{array}{1 1} Q=6.41\;Mev, \;K.E=6.29\;Mev \\ Q=48.5\;Mev, \;K.E=49.4\;Mev \\ Q=4.94\;Mev, \;K.E=4.85\;Mev \\ Q=4.85\;Mev, \;K.E=48.5\;Mev \end{array} $