On a community-center project during plan review, a long exposed PVC raceway crosses a large temperature range; what should the installer evaluate?

Why D is correct

PVC changes length significantly with temperature; accommodating movement prevents buckling and stress at enclosures. The best answer is therefore “Thermal expansion and the need for listed expansion fittings.” The other choices either address a different system, rely on an unsafe shortcut, or make a conclusion not supported by the stated facts.