Which answer matches this clue: the cave dwellings carved into limestone cliffs in Basilicata inhabited since the Palaeolithic?

• A Trulli of Alberobello
• B Sassi di Matera ✓
• C Civita di Bagnoregio
• D San Gimignano towers

The Sassi di Matera are among the oldest continuously inhabited settlements in the world and were named a European Capital of Culture for 2019.