The uproar surrounding the formation of the society of the cincinnati was triggered by

The correct answer is public fears that this was the beginning of an hereditary peerage America

Since it is a hereditary society, it means that only a limited number of people can join and the members are mostly descendants from previous members so people feared that they might organize a hereditary society in which only those who are in power might rule. They believed it was undemocratic and would undermine regular people.