After several unsuccessful attempts at endotracheal intubation and an inability to adequately ventilate a patient with a face mask, the most appropriate method to ensure ventilation is with the placement of which of the following?

a. Guedel airway c. Nasopharyngeal airway
b. Berman airway d. Laryngeal mask airway

ANS: D
According to the "Difficult Airway Algorithm", when face mask ventilation is inadequate and intubation attempts are unsuccessful, an attempt to place a laryngeal mask airway should be made.