The answer is
d - peaceful
I think the change in European life did we credit with allowing an increase in capitalistic trade is letter B which is <span> Spread of Islam in Europe.
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The British abandoned Boston in early 1776 because they were forced out of the country by the American soldiers.
American Revolutionary War was at large, and the Patriots, led by general Washington (who later became the first president of USA) won the battle at Boston, which was bloodless, by the way. This brought an end to an eight-year British occupation of the city.
