**Core Concept**
The question is testing the anatomical distribution of goblet cells, which are mucous-producing cells found in the respiratory and gastrointestinal tracts. The correct answer requires knowledge of the specific location where goblet cells are most densely packed.

**Why the Correct Answer is Right**
Goblet cells are present in the epithelial lining of various organs, including the respiratory and gastrointestinal tracts. However, their density varies significantly across different regions. The maximum density of goblet cells is seen in the **bronchi and bronchioles of the lungs**, particularly in the proximal airways. This is due to the high concentration of mucous-producing cells needed to trap pathogens and debris in the respiratory tract.

**Why Each Wrong Option is Incorrect**
* **Option A:** This option is incorrect as goblet cells are not as densely packed in the nasal mucosa as they are in the bronchi and bronchioles.
* **Option B:** This option is incorrect as while goblet cells are present in the gastrointestinal tract, their density is not as high as in the respiratory tract.
* **Option C:** This option is incorrect as goblet cells are not as densely packed in the trachea as they are in the bronchi and bronchioles.

**Clinical Pearl / High-Yield Fact**
The distribution of goblet cells is an important consideration in the diagnosis and management of respiratory diseases, such as chronic bronchitis and asthma. The high density of goblet cells in the bronchi and bronchioles contributes to the production of excess mucous, which can exacerbate respiratory symptoms.

**Correct Answer:** C. Trachea