99 points

the combination of nobles and knights created which group?

royals
peasants
vassal
lords

lords is your answer

It is not royalty, because royalty is either emperor or king, and their family.

It is not peasants, because peasants were classified towards the bottom of the 'power triangle'.

It is not vassal, because vassals usually were countries that lost to a country in a war, and was tooken over, or is a country that accepted military aid in return, paying the stronger country.

It is not lords, because lords are towards the top of the pyramid, and is directly under the king/emperor, and holds the 2nd most power.

hope this helps

c

explanation:

c

option d is correct. corroborated sources of historical evidence   is necessary to validate a claim about an event in history.

historians tend to use written sources, but audio and visual materials as well as artifacts are important objects that supply information to modern historians.

historical sources are usually divided into two categories: primary and secondary sources. depending on the historian's intent, some sources shift their designation. determining what type of sources toimplement, and the level of credibility and reliability of those sources, is a significant step in critical thinking for the historian.

explanation: