Final answer:
The expected outcome that best evaluates the presurgical goal is the client demonstrating the ability to effectively perform coughing and deep breathing exercises on their own.
Step-by-step explanation:
The expected outcome that best evaluates the presurgical goal of, "Client will understand purpose of coughing and deep breathing within 4 hours of returning to room" is the client demonstrating the ability to effectively perform coughing and deep breathing exercises on their own. This can be assessed by observing if the client understands the correct technique, can independently initiate and sustain the exercises, and reports experiencing the expected benefits of improved lung function and clearance of secretions.