This leader's policies pushed germany toward war.
otto von bismarck
kaiser wilhelm
otto von wilhelm
kaiser von bismarck

q2:

one of the major developments in the second industrial revolution was in technology.
weapons
space
business
computer


this russian leader was overthrown in the revolution of 1917.
czar nicholas ii
grigori rasputin
vladimir lenin
joseph stalin

the answer is option a.

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: