A process is allowed only if the total strangeness of the final-state particles is equal to the total strangeness of the initial-state particles.
Select all of the processes that do not occur because strangeness is not conserved.
A. p+n→p+p+K−
B. p+n→p+p+π−
C. K−+p→K−+Σ+ D. K−+p→Ξ0+K++π−
