In 1933, Hitler took action against Jews in Germany by building death camps in German cities. building Jewish ghettos in many cities. boycotting Jewish businesses. encouraging mob attacks on Jewish communities.

Let's go through the options:

by building death camps in German cities: not yet (but there was a first concentration camp already)

building Jewish ghettos in many cities. : not yet, only 1939

boycotting Jewish businesses.: yes, april 1, 1939

encouraging mob attacks on Jewish communities. - this was also a little later