For perfect intercooling in a three stage compressor

For perfect intercooling in a three stage compressor

(A) p₂/p₁ = p₃/p₂ = p₄/p₃            (Ans)

(B) p₃/p₁ = p₄/p₂

• (C)

p₁ p₂

•  =

p₃ p₄

(D) p₁ p₃ = p₂ p₄