Answer:
In the poem "Barbara Frietchie,” is true that each rhyming couplets complete a thought.
Explanation:
All the sentences in this poem are complete ideas and they do not leave any missing word or lead to any other further even, reason why they do not predict future events, even when they have some quotations they do not have what could be called dialogues, by being a full idea they can not be considered open-ended.
In general terms, the poem is made of complete thoughts.