Final answer:
Beclomethasone is used for long-term asthma control and would not be used to reverse an asthma attack, whereas Albuterol, Proventil, and Ventolin are fast-acting bronchodilators for immediate relief.
Step-by-step explanation:
The inhaler that would not be used to reverse an asthma attack is B. Beclomethasone. Beclomethasone is a type of corticosteroid that is used for long-term control of asthma rather than immediate relief of asthma symptoms. In contrast, Albuterol, Proventil, and Ventolin are all bronchodilators, which are fast-acting medications designed to quickly soothe constricted air passages during an asthma attack.