Final answer:
The expected client outcome for a client with pneumonia is for the client to maintain adequate oxygenation by discharge. The outcome criterion that indicates the goal is met is when the client no longer requires oxygen.
Step-by-step explanation:
The expected client outcome for a client with pneumonia is for the client to maintain adequate oxygenation by discharge. The outcome criterion that indicates the goal is met is option D) Client no longer requires oxygen. When a client no longer requires oxygen, it means their oxygen levels have improved and they are able to maintain adequate oxygenation on their own. This signifies that the client's pneumonia has resolved and they are ready for discharge.