GKFix MCQ Question

What is the percentage of phosphorus if m g of compound gives m1 g of Mg2P2O7?

• A. (31/222) × (m1/m) × 100%
• B. (62/222) × (m1/m) × 100%
• C. (31/1877) × (m1/m) × 100%
• D. (62/1877) × (m1/m) × 100%