Answer:
Explanation:
I think it is the belief that the earth rotated on an axis and that major advances in calculus
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.
These journalists were called muckrakers. They basically "raked the muck" out of society to make it a better place. They uncovered unsafe working conditions and unjust business practices and wrote about them to try to expose corruption.
