01 What may be learned when one wall is built over another?
Answer and explanation
Correct answer: C. Different phases of construction
Explanation: The governing concept is architectural sequence: later structures can be identified by their position over earlier remains. A wall built over an older wall suggests rebuilding, extension or modification at a later stage. It therefore helps historians reconstruct different phases of construction. It cannot show that everyone arrived together, that rainfall alone caused the feature or that no change occurred.