A nurse is providing discharge teaching to a client following a total gastrectomy. The nurse should instruct the client about which of the following medications?

A. Ranitidine: An H2 receptor blocker, typically used to reduce stomach acid, is unnecessary since the stomach has been removed. B. Vitamin K: Although important for clotting, vitamin K absorption is not significantly affected by total gastrectomy. C. Vitamin B12: Clients require lifelong vitamin B12 supplementation (usually via intramuscular injections) after total gastrectomy to prevent deficiency and associated complications such as anemia and neurological impairments. D. Metoclopramide: A prokinetic agent used to enhance gastric motility, which is not relevant after total gastrectomy.