Its D: Using credit means receiving money from a financial institution and paying it back over time.
Because they were only interested in themselves
The dictionary has the answer for you:)
Marco Polo was the trader that traveled from Venice, Italy to China and brought back information about Asia. Marco Polo was a Venetian merchant traveler. His father was the person from whom he learned the ways of mercantile trade. He did travel to China but he was not the first person. he made a detailed description in his books.