Which of the following conditions would decongestants help alleviate?

Decongestants are medications specifically designed to relieve nasal congestion caused by swelling of the nasal membranes. When a person has a cold, allergies, or sinusitis, the mucous membranes in the nasal passages can become inflamed and swollen, leading to difficulty breathing through the nose and a feeling of pressure. Decongestants work by constricting the blood vessels in the nasal passages, reducing swelling and allowing for easier airflow.

In contrast, conditions like fungal infections and fever do not stem from nasal congestion and would not be treated effectively with decongestants. Similarly, while viral inflammation can cause nasal congestion, it refers to a broader inflammatory response associated with the infection rather than direct swelling that decongestants can effectively reduce. Therefore, the conditions specifically alleviated by decongestants are those involving swollen nasal membranes, where their mechanism directly addresses the congestion experienced by individuals.