Astronomy Question about Neutrinos

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I can't seem to figure this out, I know that neutrinos have nonzero mass but I don't know how that can help me figure this out

The mass of a neutrino is
zero.
equal to the mass of a proton.
equal to the mass of an electron.
less than the mass of an electron but its actual value is unknown.
equal to the mass of a neutron

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