Which of the Following Is a Common Cause of Upper Gastrointestinal Bleeding

Mr. Santos, a 65-year-old Male, Presents to the Emergency Department with Complaints of Black, Tarry Stools for the Past Two Days. He Reports Feeling Weak and Dizzy. His Vital Signs Are Stable and He Denies Any Abdominal Pain or Vomiting. Upon Further Assessment and the Nurse Suspects Gastrointestinal Bleeding