A 34-year-old man presents to the emergency department following a stab wound to the right fifth intercostal space at the midaxillary line. Vital signs show BP 110/68 mmHg, HR 102 bpm, RR 18/min, and SpO2 98% on room air. Chest X-ray reveals a small right-sided pneumothorax without hemothorax. He denies dyspnea and breath sounds are present bilaterally. Which of the following structures is most likely damaged by this penetrating thoracic injury?

1. A)Right atrium
2. B)LiverGABARITO
3. C)Upper lobe of right lung
4. D)Superior vena cava
5. E)Right pulmonary artery