A 70-year-old woman is transferred to a rehabilitative service 2 days after operative repair of a fracture of the right

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A 70-year-old woman is transferred to a rehabilitative service 2 days after operative repair of a fracture of the right femur. She weighs 65 kg (143 lb). Findings on physical and mental status examinations are unremarkable. Which of the following is the most important predictor of success in the rehabilitation of this patient?

A) Activity level before the fracture
B) Age
C) Postoperative hemoglobin concentration
D) Serum calciumc oncentration
E) Serum vitamin D concentration