What long-term control therapy is indicated for Marci, age 15, diagnosed with step 1 (intermittent) asthma?

For a 15-year-old patient diagnosed with step 1 (intermittent) asthma, the appropriate long-term control therapy is actually not indicated at this step. Step 1 asthma is characterized by infrequent symptoms that occur less than twice a week, and nighttime awakenings occurring less than twice a month. In this case, the management typically involves a "step-up, step-down" approach where daily medication is not necessary.

Patients with intermittent asthma are advised to use a short-acting beta agonist (SABA) as needed for symptom relief rather than having a daily long-term control medication.

Inhaled corticosteroids or other long-term medications are reserved for patients with more persistent forms of asthma (step 2 or higher) where symptoms are more frequent and require continuous control. Therefore, in this scenario, the absence of a long-term control therapy is appropriate, making the initial option of "None" the correct choice.