Hello can someone please help me with this question!

Nazi concentration camps served three main purposes: To incarcerate people whom the Nazi regime perceived to be a security threat. These people were incarcerated for indefinite amounts of time. To eliminate individuals and small, targeted groups of individuals by murder, away from the public and judicial review. The major purpose of the earliest concentration camps during the 1930s was to incarcerate and intimidate the leaders of political, social, and cultural movements that the Nazis perceived to be a threat to the survival of the regime. The first Nazi concentration camp was Dachau, established in March 1933, near Munich. The Nazis attempted to either partially or completely dismantle the extermination camps in order to hide any evidence that people had been murdered there. This was an attempt to conceal not only the extermination process but also the buried remains. As a result of the secretive Sonderaktion 1005, the camps were dismantled by commandos of condemned prisoners, their records were destroyed, and the mass graves were dug up. Some extermination camps that remained uncleared of evidence were liberated by Soviet troops, who followed different standards of documentation and openness than the Western allies did. As a matter of political training, some high-ranked Nazi Party leaders and SS officers were sent to Auschwitz–Birkenau to witness the gassings; Höss reported that, "all were deeply impressed by what they saw ... [yet some] ... who had previously spoken most loudly, about the necessity for this extermination, fell silent once they had actually seen the 'final solution of the Jewish problem'." As the Auschwitz Camp Commandant Rudolf Höss justified the extermination by explaining the need for "the iron determination with which we must carry out Hitler's orders"; yet saw that even "[Adolf] Eichmann, who certainly [was] tough enough, had no wish to change places with me”

Explanation:

Concentration camp, internment centre for political prisoners and members of national or minority groups who are confined for reasons of state security, exploitation, or punishment, usually by executive decree or military order.

Explanation:

a,b,d are the three sentences that use a reflexive pronoun

answer: do

the 'italicized phrase' is a noun clause that is used as a direct object.