Why did the students post their “twelve theses” in the entrance hall of the university?
a. to show their opposition to nazi policies
b. to show their support for a jewish teacher who was about to be fired
c. to demand reforms to university tuition policies
d. to call for the expulsion of all non-german professors

puritans hope this

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: