$\pi$ ⁺ Represents a Pion (A Meson) $\pi$ ^- Represents a Muon (A Lepton), V_e Represents an Electron

Multiple Choice

$\pi$ ⁺ represents a pion (a meson) , $\pi$ ^- represents a muon (a lepton) , v_e represents an electron neutrino (a lepton) , and v represents a muon neutrino (a lepton) .Which of the following decays might occur?

A) " $\pi$ ⁺ $\rightarrow$ $\mu$ ^- + v _$\mu$ "
B) " $\pi$ ⁺ $\mu$ ⁺ + v_e"
C) ""
D) ""
E) " $\pi$ ⁺ $\rightarrow$ $\mu$ ⁺ + v _$\mu$ "