Final answer:
A tracheostomy collar is the correct oxygen delivery device for a client with a percutaneous tracheostomy as it delivers oxygen directly to the trachea, ensuring effective oxygenation.
Step-by-step explanation:
The nurse caring for a client with a percutaneous tracheostomy (PCT) who requires oxygen should select c) Tracheostomy collar as the most appropriate delivery device. Unlike other methods such as face tents, nasal cannulas or simple masks, a tracheostomy collar is specifically designed to fit around a tracheostomy tube and deliver oxygen directly to the trachea. This delivery device ensures that the oxygen is effectively and efficiently delivered where it is most needed.