What is a good example of a topic sentence for an argumentative essay?

What was feudalism? (define the structure)

How do you think sintonis fiancée reacted to receiving this letter?

Which statement describes the primary purpose of the european union? question 1 options: to protect european nations in the event of another world war to work together to strengthen europe and benefit all member nations to prevent alliances from forming between member nations to share resources and make economic trade easier between coal and steel companies