Lee is in customer service. How can she best support her internal customer, Dan? O al Prioritize other tasks and customers O b) Ask him a lot of personal questions O c) Give him her full attention when he's speaking O d) Check with him before completing basic tasks

the event is known to be the soviet union.

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 can

explanation: