The book Kalila wa Dimna is an Arabic translation of the Panchatantra. The Panchatantra is a collection of fables and moral stories that originated in ancient India. It is believed to have been written in Sanskrit around 200 BCE by Vishnu Sharma.

Option 1, Hitopadesha, is another collection of fables from Indian literature, but it is not the Arabic translation of Kalila wa Dimna. The Hitopadesha was written in Sanskrit by Narayana Pandit in the 12th century.

Option 3, Suryasiddhanta, is not related to the Kalila wa Dimna. Suryasiddhanta is an ancient Indian astronomical text that provides information about the movement of the sun.

Option 4, Kathasaritsagara, is a collection of tales and stories in Sanskrit, but it is not the Arabic translation of Kalila wa Dimna.

In conclusion, the correct answer is option 2, Panchatantra. Kalila wa Dimna is an Arabic translation of this ancient Indian collection of fables and moral stories.