**Core Concept**
Static compliance of the lungs refers to the change in lung volume that occurs with a given change in transpulmonary pressure when the chest wall and lungs are not moving and the airways are kept open. It is an important parameter in understanding the mechanical properties of the lungs and is affected by various factors such as lung volume, lung density, and chest wall compliance.

**Why the Correct Answer is Right**
Static compliance is a measure of the lung's ability to expand and fill with air when the chest wall and lungs are not moving. A decrease in static compliance indicates that the lungs are stiffer and less able to expand, which can be seen in conditions such as pulmonary fibrosis, where the lung tissue becomes scarred and less compliant. This can lead to a decrease in lung volume and an increase in the work of breathing.

**Why Each Wrong Option is Incorrect**
**Option A:** This option is incorrect because conditions that cause an increase in lung volume, such as emphysema, actually increase static compliance, not decrease it.
**Option B:** This option is incorrect because atelectasis, which is the collapse of lung tissue, actually decreases lung volume and would therefore decrease static compliance.
**Option C:** This option is incorrect because conditions that cause an increase in lung density, such as pulmonary edema, would actually decrease static compliance, not increase it.

**Clinical Pearl / High-Yield Fact**
It's essential to remember that static compliance is a measure of the lung's ability to expand and fill with air when the chest wall and lungs are not moving, and it is affected by various factors such as lung volume, lung density, and chest wall compliance.

**Correct Answer:** D.