C)Miguel de Cervantes
The Baldassare Castiglione was the renaissance writer that was also worked as an adviser, or courtier, to royalty. Option A is correct.
What was written by Baldassare Castiglione?
The Book of the Courtier, or Il Libro del Cortegiano, was written, and this was composed by Count Baldassare Castiglione, who was born in 1478 and passed away in 1529. It was originally printed in Italian dialect in 1528.
The ultimate “how to” manual for ambitious courtiers, the book offers a unique glance into Renaissance court life. The Renaissance was embodied in Castiglione's book for academics of the late 19th and primal 20th centuries.
It corresponded to a model of conduct that rated the court as the cornerstone of new social standards.
Therefore, option A is correct that The Renaissance author Baldassare Castiglione also sufficed as a courtier or adviser to the monarch.