Which of the following books was written by Panini?

Ashtadhyayi

The correct answer is Option 3- Ashtadhyayi

The book Ashtadhyayi was written by Panini.

Panini was a Sanskrit grammarian who lived in the 5th century BCE. He is considered to be the father of Sanskrit grammar, and his work, the Ashtadhyayi, is the most comprehensive and authoritative treatise on Sanskrit grammar.

The Ashtadhyayi is divided into eight chapters, or adhyayas. Each chapter deals with a different aspect of Sanskrit grammar, such as morphology, syntax, and semantics. The Ashtadhyayi is a complex and sophisticated work, and it has been studied by scholars for centuries.

The other options are incorrect. Raghuvamsa was written by Kalidasa, Kathasaritsagara was written by Somadeva Bhatta, and Manusmriti was written by Manu.