A client complaining of mouth soreness had a gastrectomy 6 m…

A client complaining of mouth soreness had a gastrectomy 6 months ago following a diagnosis of stomach cancer. During the assessment, the nurse notes that the client’s tongue is beefy, red, and smooth, and the client’s skin appears yellowish. Lab results show a vitamin B12 deficiency. Which of the following complications is this client most likely experiencing?