Locke's belief in the social contract between a government and it's people meant that

Choice A) Citizens should agree to obey their government as long as the government protected their natural rights.

In his "Two Treatises of Government" (1689), John Locke claimed that men are by nature free and equal, but with the purpose to interact in a healthy society, it was necessary that they transferred some of their rights to a government. Such government had to be elected by the people and changed by the people; it had to be divided into legislative and executive powers and had to make decisions that benefit the citizens, that is to say, that protected their natural rights, and whenever it failed to do so, it was people's duty to replace the government.

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b: the exchange of coined money