Economic problems for many countries in Europe in the 1920s and 1930s were mainly caused by "<span>B. World War I," since this war left many countries torn apart in terms of their economies. </span>
The answer you are looking for is True.
Italian merchants wanted to avoid working with Muslim middle-men who would take a part of the profit for supplying them with Asian goods. They developed naval travel to travel on their own and increase their profit.