How did the actions of the americans following the discovery of the camps reflect a changing understanding of what had occurred during the holocaust?

Americans were involved

Explanation:  Although most Americans, preoccupied with the war itself, remained unaware of the terrible plight of European Jewry, the American Jewish community responded with alarm to Wise’s news. American and British Jewish organizations pressured their governments to take action. As a result, Great Britain and the United States announced that they would hold an emergency conference in Bermuda to develop a plan to rescue the victims of Nazi atrocities.

Ironically, the Bermuda Conference opened in April 1943, the same month the Jews in the Warsaw ghetto were staging their revolt. The American and British delegates at Bermuda proved to be far less heroic than the Jews of Warsaw. Rather than discussing strategies, they worried about what to do with any Jews they successfully rescued. Britain refused to consider admitting more Jews into Palestine, which it administered at the time, and the United States was equally determined not to alter its immigration quotas. The conference produced no practical plan to aid European Jewry, although the press was informed that “significant progress” had been made.

Following the futile Bermuda Conference, American Jewish leaders became increasingly involved in a debate over Zionism. But the Emergency Committee to Save the Jewish People of Europe, led by Peter Bergson and a small group of emissaries from the Irgun, a right-wing Palestinian Jewish resistance group, turned to pageants, rallies, and newspaper advertisements to force Roosevelt to create a government agency to devise ways to rescue European Jewry. The Emergency Committee and its supporters in Congress helped publicize the Holocaust and the need for the United States to react.

i believe the correct answer is option b. most eastern european nations joined nato.

though i could be wrong, option d. the eastern european nations were granted complete independence, would be another choice.

hope this ! : )