Conversation so far:
Where did Hannah Arendt grow up?
Arendt was born in Hanover, Germany but mostly raised in Königsberg
Where did Hannah Arendt go to school?
After completing her secondary education, she studied at the University of Marburg

Question: What did she major in?
Self-contained rewrite: What did Hannah Arendt major in after completeing her secondary education and studying at the University of Marburg?