Answer:
Complex Calendars.
Explanation:
The Mayans were one of the first to create calendars, using observatories to take note of the stars and how they "rotated the earth". Using such, they could determine the approximate time as well as seasons.
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Letter A is correct I think but don't rely on me too much K
The delegates discussed improvements for the Articles of Confederation, this was in September 1786 and the delegates actually called for the Constitutional convention.
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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.
