How did the league of nations deal with offending nations check all that apply

Verbal warnings, economic sanctions, and military force.

Explanation:

The league used verbal warnings to tell countries whenever they committed acts of aggression, and used economic sanctions as a form of punishment to hurt their economy. In certain circumstances, they would also use military force to punish transgressors.

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: