Choose lhe correct alternative for the translation of the un...

Choose lhe correct alternative for the translation of the underlined words, according to the text.

Ask any ltalian, and they've likely never heard of ancient Norba, once a flourishing Latin city located around 50 km south of Rome. Perched on the edge of a cliff in the Lepini Mountains in western ltaly's Lazio region, 'Norba, now in ruins, is one of the country's best preserved examples of city planning from several thousands of years ago. lts location was almost impenetable: surrounded by a waIl constructed of colossal limestone boulders, there was only one-way in and out.

Font: http://www.bbc.com/travel/story/20170303-the-italian-city-that-stood-up-to-rome