A Series of Possible Particle Processes Are Listed Below $\gamma=$ A Photon

Multiple Choice

A series of possible particle processes are listed below. Which (if any) are probably not processes mediated by the weak interaction? (Note: $\gamma=$ a photon, $\mu=$ a muon, which is a lepton like the electron but heavier. Don't worry about conservation of energy.)

A) $n+e^{+} \rightarrow p^{+}+\bar{v}$
B) $v+n \rightarrow p^{+}+\mu^{-}$
C) $\bar{v}+p^{+} \rightarrow n+e^{+}$
D) $e^{+}+e^{-} \rightarrow \gamma+\gamma$
E) All might be weak processes.