Where was the most important distinction in the aryan caste system?
a. between the first and lower castes
o b. between the priests and everyone else
o c. between the top three and the lowest castes
o d. between the top two and the lower two castes

i think its the outcome of people's preferences.

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:

whose power in the senate is equal to the power of the speaker of the house?

im not sure its either a leader of a group of congresspeople or a person from a congressmans district

sorry im not sure