The voyage and travail of sir john Mandeville was written in ___

The correct option is Midland dialect.

The Voyage and Travail of Sir John Mandeville (commonly known as Mandeville's Travels) is a famous travel memoir compiled in the mid-to-late 14th century, originally written in French and subsequently translated into many languages.
When the text was translated into Middle English during the late 14th century, the translation was executed in the Midland dialect (specifically the East Midland dialect). This dialect is particularly significant because it served as the primary foundation for the development of modern standard English.