A gastric biopsy is performed on a patient with suspected graft-versus-host disease following bone marrow transplantation. The biopsy demonstrates many isolated dying epithelial cells in crypts showing fragmented, hyperchromatic nuclei and small discrete blebs containing both cytoplasm and nuclear fragments. The biopsy demonstrates which of the following?
Apoptosis Caseous neurosis Coagulative necrosis Gangrenous necrosis