What three options did kennedy's staff consider as a response to soviet missiles headed to cuba? sink any soviet transports. take out all the missile sites. attack russia through berlin. conduct a military invasion. assassinate cuba's fidel castro. run a blockade or quarantine.

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: