Final answer:
Keira's response falls under the principle of reasonable skill and care in the real estate profession.
Step-by-step explanation:
Keira's response to her buyer client about the wall being structural falls under the principle of reasonable skill and care in the real estate profession. By suggesting to have a structural engineer assess the wall, Keira is ensuring that her client receives the most accurate and expert opinion regarding the structural integrity of the wall. This demonstrates her commitment to providing the best possible service and advice to her client.