In the first phase of the holocaust, hitler and the nazis were successful in separating the jews from the rest of the population with the use of

Jews were obliged to use the David Star (Jewish Star) to be identified.

Explanation:

According to the historian Raul Hilberg, there is six stages of persecution against Jewish people that led to the Holocaust:

The idea of Jewish being identified, or labeled, how Hilberg used to say, can be included in the first stage - Definition. To define a Jew, however, more than just use the David Star, Nazi used other ways to create an identification such as physical aspects, and the bloodline.

The answer you are looking for here is "Ghettos"

This is a multiple-choice question and the answers are

Deportation

Extermination

Propaganda

Ghettos

The person above is correct and ghettos is the answer you should pick