The Fact That the Reaction ³⁷Cl $\bar{v}_{\mathrm{e}}$ $\to$

Multiple Choice

The fact that the reaction ³⁷Cl + $\bar{v}_{\mathrm{e}}$ $\to$ ³⁷Ar + e^- is not observed whereas the reaction p + $\bar{v}_{\mathrm{e}}$ $\to$ n + e⁺ is observed is understandable in terms of the conservation of

A) baryon number
B) energy
C) lepton number
D) charge
E) angular momentum