**Core Concept**
The management of postoperative lung collapse involves restoring lung expansion and preventing further complications. **Physiotherapy** and **incentive spirometry** play a crucial role in this setting.

**Why the Correct Answer is Right**
The correct answer is not explicitly stated, but the treatment of choice for postoperative lung collapse often involves **physiotherapy**, including techniques such as chest percussion, vibration, and incentive spirometry to encourage deep breathing and lung expansion.

**Why Each Wrong Option is Incorrect**
**Option A:** Without knowing the specific option, it's difficult to provide a detailed explanation, but incorrect options might include treatments that are not directly aimed at expanding the lung or improving respiratory function.
**Option B:** Similarly, without the specific text, it's challenging to address, but it could be a treatment that, while useful in some respiratory conditions, is not the first line for postoperative lung collapse.
**Option D:** This could potentially be an option that is more invasive or not typically used as a first-line treatment for postoperative lung collapse.

**Clinical Pearl / High-Yield Fact**
A key point to remember is that early mobilization and **incentive spirometry** are crucial in preventing and managing postoperative lung collapse, as they help in maintaining lung volumes and preventing atelectasis.

**Correct Answer:** Not provided in the query, but typically, the answer would involve a form of **physiotherapy** or **incentive spirometry**.