The answer is D, you're definitely correct.
Castiglione thought that the ruling class should follow a standard of conduct.
Machiavelli believed that the rulers must look like they are generous but that they must do what they need to do to keep order.
Nathaniel Bacon was a colonist of Virginia Colony and he was known for instigating the Bacon's rebellion that ended when he himself died.
He led a rebellion against the wealthy land owners of Virginia in 1676 because he resented the Virginia's governor's friendly policies towards native Americans. Bacon was helping the African Americans as they endured attacks by natives and the Governor, William Berkeley refused to retaliate against the native attackers.
Because it is important to know the composition of the object
Density is the ratio of the mass of a sample to the volume occupied by that mass, and expresses how much mass there is per unit volume of a given portion of matter. Density is a physical property of extreme importance in the characterization, identification and use of substances or materials.
