Which courtier to the royal family of the city-state of Mantua wrote a guide that described how a courtier should act while serving at court?

ACosimo de' Medici
BCesare Borgia
CMachiavelli
DCastiglione

Verified Answer :

D. Castiglione

Cesare Borgia was the Son of the Pope and Cosimo de Medici's family ruled Florence, so neither have anything to do with the royal family of Mantua. Machiavelli wrote the Prince, so that is not the correct answer either. Castiglione was part of the Royal family of Mantua and did write the Book of the Courtier. So D is the correct answer.

It should be D :)

Hope this helps