**Core Concept**
Pneumothorax due to blunt injury involves the rupture of alveoli or bronchi, leading to air leakage into the pleural space, resulting in lung collapse. This condition is often associated with the sudden increase in intrathoracic pressure.

**Why the Correct Answer is Right**
The correct management of pneumothorax due to blunt injury involves the insertion of a chest tube (also known as a thoracostomy tube) to re-expand the lung and prevent further air leakage. This is typically done under ultrasound guidance to confirm the correct placement of the tube. The chest tube is connected to a drainage system to remove air and fluid from the pleural space, allowing the lung to re-expand and improving oxygenation.

**Why Each Wrong Option is Incorrect**
**Option A:** This option is incorrect because it does not address the primary issue of air leakage into the pleural space. A simple dressing or bandage would not be sufficient to manage a pneumothorax.
**Option B:** This option is incorrect because it implies the use of a non-invasive treatment for a condition that requires surgical intervention. Non-invasive methods such as positive pressure ventilation or sealants may be used in specific cases, but they are not the primary treatment for pneumothorax due to blunt injury.
**Option C:** This option is incorrect because it does not mention the use of a chest tube, which is a crucial step in managing pneumothorax due to blunt injury.

**Clinical Pearl / High-Yield Fact**
In cases of traumatic pneumothorax, it is essential to remember that a large pneumothorax can lead to significant hemodynamic instability, including hypotension and cardiac arrest. Prompt recognition and management of pneumothorax are critical in preventing these complications.

**Correct Answer:** C. Chest tube insertion