In which year did Hitler become Reich Chancellor?

EDITORIAL LEARNING AID

Why is this answer correct?

Adolf Hitler was appointed Reich Chancellor on 30 January 1933 and thus became head of government. In 1923 his putsch in Munich failed, and in 1927 he still held no government office. By 1936 he was already a dictator and had long been in office.

30 January 1933: Hitler becomes Reich Chancellor.

This translation and explanation are editorial learning aids. The official German wording and answer key govern the examination.