Why a free neutron decays but a free proton does not

1. A.
   not possible as proton mass is less than the neutron mass
2. B.
   possible only inside the nucleus
3. C.
   not possible but neutron to proton conversion is possible
4. D.
   always possible as it is associated only with $\beta^{+}$decay

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1. A.
   proton is a charged particle
2. B.
   neutron is an uncharged particle
3. C.
   neutron is a composite particle made of a proton and an electron
4. D.
   neutron has larger rest mass than proton

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