Which of the Following Make(s) Coexistence of Species 1 and 2

Which of the following make(s) coexistence of species 1 and 2 more likely?

A) higher values of both r₁ and r₂
B) lower values of both N₁ and N₂
C) higher values of both K₂ and K₁
D) lower values of both $\alpha$ _1,2 and $\alpha$ _2,1