Explanation:

First statement is correct. The Gaha Sattasai or Gaha Kosha is an ancient collection of Indian poems in Prakrit language of Maharashtra. The poems are about love and love's joy. They are written as frank monologues usually by a married woman, or an unmarried girl. The collection is attributed to the king Hala who lived in the 1st century.
Second statement is correct. After the destruction of Kshaharata power Gautamiputra Satakarni restored of the fortunes of the Satavahana family.
Third statement is correct. Satavahana empire was divided into Janapadas, Aharas and Gramas.
Fourth statement is incorrect. Somadeva, Kashmiri Brahman of the Saiva sect and Sanskrit writer who preserved much of India's ancient folklore in the form of a series of tales in verse. The court poet to King Ananta of Kashmir, Somadeva apparently was commissioned to compose a cycle of stories to amuse and calm the queen.