A 58-year-old obese man with a 10-year history of GERD presents with worsening dysphagia and 8-kg unintended weight loss over 3 months. He takes omeprazole daily but remains symptomatic. Vital signs: BP 128/82, HR 92, RR 16, Temp 37°C, SpO2 98%. Upper endoscopy reveals a distal esophageal mass within an area of intestinal metaplasia. Biopsy shows adenocarcinoma. No dyspnea or hematemesis noted. Which diagnosis best explains these findings?

1. A)Zenker diverticulum
2. B)Esophageal squamous cell carcinoma
3. C)Esophageal adenocarcinomaGABARITO
4. D)Esophageal candidiasis
5. E)Diffuse esophageal spasm