<span>Norsemen, or Northern men, of Scandanavia also called Vikings. They were superb shipbuilders and sailors and started building settlements, Western Europe was beset by a wave of invasions
The barter system was an old way to exchange goods in place of money. In the Middle Ages, Europeans traveled around the world and exchange crafts and other materials. The barter system has its disadvantages, it was quite difficult to carry goods from one place to another, and the value of the goods was not priced well. Silk Road also played an important role in bringing money in use, small silver coins were brought to use.
The blockade of West Berlin was counteract by the establishment of a massive airlift with supplies from the United States, France and the United Kingdom in 1948 and 1949. The right answer is C.
