Question

before he became chancellor, hitler was imprisoned for a year for attempting to
assassinate the weimar governments leader.
overthrow the weimar government.
buy votes for the upcoming election.
set the reichstag on fire.

Explanation:

Hitler was imprisoned for his role in the Beer - Hall Putsch, an attempt to overthrow the Weimar government. He was not imprisoned for assassinating a leader, buying votes, or setting the Reichstag on fire at that time.

Answer:

B. overthrow the Weimar government.