The correct answer is A) We must provide a good example to others.
Another way to express the main idea of this quote is "we must provide a good example to others."
We are talking about the Puritans that arrived in American to found the Plymouth colony. It was Puritan leader John Winthrop who said “We must consider that we shall be as a City upon a Hill. The eyes of all people are upon us.” As they were very strict religious people, Winthrop tried to share the idea with his people that they should be responsible enough to set the right example in their lives.
Let's remember that Puritans followed strict religious practices and left Britain because they had differences with the Church of England and were trying to find a new place to live and practice their religious beliefs.