One reason for the german surrender in 1918 was that
a. many german soldiers were no longer willing to fight.
b. the german submarine fleet had been destroyed..
c. the german blockade of france failed.

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:

b) he seized power from the directory and appointed himself emperor

happy to

pls mark as brainliest