I keep getting it wrong !! Someone just help for once please

State whether or not each of the following reactions is permitted, giving a reason if it is not permitted.

a. Electron neutrino + proton —> neutron + electron
b. Electron antineutrino + proton —> neutron + positron
c. Electron neutrino + proton —> neutron + positron
d. Electron antineutrino + proton —> neutron + antimuon

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