What fact best explains why it is significant that angelou's narrative is set in 1940?

a) in 1940, the united states was not yet involved in world war ii.

b) in 1940, segregation of blacks and whites was still the norm.

c) in 1940, most high school students did not go on to college.

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:

i believe the answer is c