The quark contents of the following particles are: the beauty hyperon b = dub, the charmed

The quark contents of the following particles are: the beauty hyperon Λ_b = dub, the charmed meson D⁰ = cū, the beauty mesons B⁺ = ub̅, B = ūb and B⁰ = db̅. 

Which of the following reactions are allowed: 

(a) π^- p → D₀Λ_b, 

(b) π^-p → B⁰Λ_b, 

(c) π^- p → B⁺ Λ_bπ^-, 

(d) π^- p → B^-Λ_bπ⁺, 

(e) π^- p → B^-B⁺?