GKFix MCQ Question

How can the total vapour pressure of a solution be expressed in terms of x2?

• A. ptotal = p2⁰ + (p1⁰ - p2⁰)x2
• B. ptotal = p1⁰ + (p1⁰ - p2⁰)x2
• C. ptotal = p2⁰ + (p2⁰ - p1⁰)x2
• D. ptotal = p1⁰ + (p2⁰ - p1⁰)x2