A 55-year-old African American female with a past medical history significant for recurrent esophageal reflux presents for her scheduled upper GI endoscopy. A biopsy of the tissue surrounding...

A 55-year-old African American female with a past medical history significant for recurrent esophageal reflux presents for her scheduled upper GI endoscopy. A biopsy of the tissue surrounding the lower esophageal sphincter reveals normal intestinal epithelial cells in place of the usual squamous cells; the cells extend to the basement membrane. What type of change has occurred?

A. No change, this is normal epithelium

B. Dysplasia

C. Metaplasia

D. Carcinoma in situ