A 58-year-old Indian woman presents with progressive fatigue, paresthesias in both feet, and difficulty walking for 3 months. Peripheral blood smear shows macrocytic RBCs with several cells displaying nuclear segmentation. The structure marked C in the diagram shows a neutrophil with 6 nuclear lobes. Serum B12 is 180 pg/mL (normal 200–900), and methylmalonic acid is elevated. Which of the following is the MOST appropriate next step in management?

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