Answer:
Marissa and the man are in a waiting room at a doctor's office. Marissa is feeling impatient about waiting and anxious about the diagnosis that her doctor is about to share with her.
Step-by-step explanation:
Marissa was concerned about her diagnosis as she watched the advertisement for the breast cancer drugs. She is obviously in the doctor's office as a result.
As a result, the man across the room was also at the doctor's office and was upset by the diagnosis.
The conclusion from the excerpt is that Marissa and the man are both at the doctor's office, and that Marissa is impatiently waiting outside for the diagnosis report.