After answering a client's call light, the nurse discovered the client gasping and expressing difficulty breathing, stating, "I can't get my breath." The nurse promptly administered supplemental oxygen and adjusted the client's position, resulting in the alleviation of symptoms. When documenting this incident, how should the nurse describe the client's condition?
a. orthopnea
b. bradypnea
c. dyspnea
d. Cheyne-Stokes breathing