Final answer:
The nurse's understanding of concept maps in client care is best reflected in the statement that emphasizes seeing the patient holistically, recognizing all health issues in an interconnected way.
Step-by-step explanation:
The statement by the nurse that reflects the best understanding of the usefulness of a concept map to client care is: "Concept maps help me see the whole client, not just individual health problems." This statement captures the holistic perspective that concept maps offer by allowing healthcare providers to see how various health issues and treatments are interconnected. Concept maps assist in visualizing the complete care needs of a client, identifying patterns, connections, and priorities in care, which is fundamental in providing effective patient-centric healthcare.