Which answer matches this clue: the prehistoric cone-shaped dwellings with limestone roofs found in the town of Alberobello in Apulia?

• A Nuraghi
• B Sassi
• C Pagghiari
• D Trulli ✓

The trulli of Alberobello are a UNESCO World Heritage Site; their dry-stone conical roofs were easily dismantled to evade property taxes.