The Munda language group belongs to the Austric family. The Austric language family is a proposed linguistic grouping that includes various languages spoken in South Asia and Southeast Asia. It is named after the Austroasiatic language family, which includes languages like Vietnamese, Khmer, and Mon-Khmer.

Option 1: Austric - This option is correct. The Munda language group belongs to the Austric language family.

Option 2: Dravidian - The Dravidian language family includes languages spoken in South India, such as Tamil, Telugu, and Kannada. It is not related to the Munda language group.

Option 3: Sino-Tibetan - The Sino-Tibetan language family includes languages spoken in East Asia, such as Chinese and Tibetan. It is not related to the Munda language group.

Option 4: Indo-European - The Indo-European language family includes languages spoken in Europe, South Asia, and Western Asia, such as English, Hindi, and Persian. It is not related to the Munda language group.

In summary, the correct answer is option 1, Austric, as the Munda language group belongs to the Austric family.