GKFix MCQ Question

What is the potential difference V(A) – V(C) equal to in terms of emfs and resistances?

• A. e1 + e2 + I(r1 + r2)
• B. I(r1 + r2)
• C. e1 – e2 + I(r1 + r2)
• D. (e1 + e2) – I(r1 + r2)