The correct answer is option 3: Legal document. The 13th Century text Lekhapaddhati provides information on the topic of legal documents. This text is a guidebook that outlines the proper procedures and formats for drafting legal documents. It gives instructions on how to create various types of legal documents, such as land deeds, contracts, and wills. It also provides guidance on the appropriate language and structure to be used in these documents.

Option 1, which suggests that the text is about the art of writing, is not accurate. While the Lekhapaddhati does deal with writing, its focus is specifically on legal writing and not on other forms of writing like literature or creative writing.

Option 2, essay writing, is also incorrect. The Lekhapaddhati does not provide information or guidance on how to write essays.

Option 4, epigraphic style, is not relevant to the topic of the Lekhapaddhati. Epigraphy refers to the study and interpretation of ancient inscriptions, usually engraved or carved into stone or metal. The Lekhapaddhati does not discuss epigraphic style or provide information related to it.

In conclusion, option 3, legal documents, is the