A main idea of "A Model of Christian Charity is option B: the settlers’ survival depends on their ability to work together.
The model of Christian charity that is mostly concerned with the principles and laws that were commanded by God.
One of the basic ideas lied in giving to those that  were in need. According to Winthrop, this was the basic idea behind the new Christian community that the Puritans wanted to have.
Therefore, correct option is B.
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