Four particles given, have same momentum which has maximum kinetic energy
Proton
Electron
Deutron
$\alpha $-particles
Four particles given, have same momentum which has maximum kinetic energy
$E = \frac{{{P^2}}}{{2m}}$
$E \propto \frac{1}{m}$ (If $P =$ constant)
i.e. the lightest particle will possess maximum kinetic energy and in the given option mass of electron is minimum.