Which plateau is known as the ‘roof of the world’?

The correct answer is Option (2) → Tibetan Plateau

The Tibetan Plateau, lying between the Himalayas in the south and the Kunlun Mountains in the north, is the highest and largest plateau in the world, with an average height of more than 4,500 metres. Because it stands so high above the rest of the land, it is called the ‘roof of the world’. Great Asian rivers such as the Indus, the Brahmaputra (Tsangpo), the Yangtze and the Mekong rise on or near it.