Which level of Hell contains the treacherous, according to Dante's Inferno?

In Dante's Inferno, Circle 9 is specifically designated for the treacherous, referred to as the ninth circle of Hell. This circle is the lowest in Dante's portrayal of the underworld and is divided into four regions known as rounds, each corresponding to different types of betrayal. The treacherous are punished here for their acts of betrayal against family, friends, country, and benefactors, aligning with Dante's moral framework where treachery is viewed as one of the gravest sins. The treacherous souls are frozen in a lake of ice, symbolizing the coldness of their betrayal.

Other levels of Hell serve different categories of sins. Circle 7 is reserved for the violent, Circle 8 for the fraudulent, and Circle 6 addresses the heretics. Each of these circles punishes specific sins according to Dante's structured ethical vision, but it is Circle 9 that directly punishes those who have betrayed trust, making it the correct answer for the location of the treacherous in Dante's Inferno.