What must be true for two coexisting liquid phases?

• A. YiL(1)xi(1) = YiL(2)xi(2)
• B. YiL(1)xi(1) = xi(2)
• C. YiL(1)xi(1)= YiL(2)yi(2)
• D. YiL(1)xi(1) = XiL(2)xi(2)