In a speech about valley fever, a potentially deadly disease that has reached serious proportions in several southwestern states, a speaker said:
After being plagued by asthma attacks in Hawaii for six years, Lori Crown hoped to find relief by moving to the dryer climate in Bakersfield, California. A few months after arriving in Bakersfield, Crown was suffering from severe headaches, swollen feet, painful bumps on her hands and legs, and a prolonged fever. The diagnosis—valley fever.
To combat the disease, Crown has to take fluconazole, an antifungal drug that costs $685 for a one-month supply of pills. Although the drug helps, Crown still gets painful headaches, frequent fevers, and debilitating fatigue. "It's so frustrating," Crown says. "One day I'll feel fine, then I'll be in bed for the next three." Most days she wishes she had stayed in Hawaii.
According to your textbook, what kind of supporting material is used in this statement?