The correct answer is
D) settling conflicts associated with the settlement of western lands
(The issue over the western lands was solved under the Articles.)
The correct answer is manifest destiny.
Manifest destiny is the belief that it was America's god given right to expand from "sea to shining sea." In other words, it was America's destiny to expand their control across the entire North American continent from the Atlantic to the Pacific Ocean. This belief resulted in the US buying land from other countries, fighting in wars, and taking land from Native Americans in order to achieve this goal. This was present throughout American society during the early to middle of the 19th century.
Recently converted Britons, if we're talking about the Middle ages and the wave of christenings that were occuring at the time, then we can say that they were at first somewhat reluctant about their new faith. Over time, however, they had grown accustomed to it and respected it deeply.