The correct answer is - A. the lunar calendar.
The Babylonians are well known for their ingenuity, and they managed to break the ice in lots of scientific fields, as well as constructing lots of things for practical usage that are of great value for the daily functioning of the people. One of them was the lunar calendar. This calendar was used for organizing the things better in the society, based on the time of the year, and it was also of great help in the sense of having orientation in time and planning for the future. Since this calendar was based on the Moon, it meant that the Babylonians had to observe the movement and shape of the Moon on the sky which was a step forward in astronomic sense.
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Imperialism led to competition between countries for colonies, increasing tensions
In October 1962 American spy planes discovered new play missiles on the island of Cuba put there by the Soviet union. President Kennedy's answer to this Cuban missile crisis was to quarantine the island until he and Kremlin, the Soviet Union dictator at the time, made a "hotline ". Kremlin agreed to take a nuclear missiles out of Cuba if United States took their nuclear missiles out of turkey. so in the end so you get union ships turned around and President Kennedy took down the naval blockade around Cuba
