A 50 year old man presents with multiple pathological fractures.His serum calcium was 11.5 mg/dl and phosphate was 2.5 mg/dl.Alkaline phosphatase was 940 I.U./dl. The most probable diagnosis is -

• A. Osteoporosis
• B. Osteomalacia
• C. Multiple Myeloma
• D. Hyperparathyroidism