Does someone have the time to do these quick questions? :(
I don't know them:(

your answer for the first and third question is primary source

your answer for the fourth question is secondary source but I dont know about the answer on number 2

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:

the answer is c my brotha. c.   formed an alliance with the soviet union.