Answer:
a. gold coins
Explanation:
Marco Polo was impressed by the paper money, coal burning and gunpowder in China. But, gold coins are not new to him.
Answer: A. industrialization
Industrialization has changed land use and led to the growth of large cities in many countries since 1800’s. Moreover, it became centers of population and production where the invention of railroads took place and manufacturing centers began its operation, allowing migration from rural to urban areas that give rise to new cities.
Hurting because during the stock market crash there was barely enough money left and to pay for trade would be even more money so it would hurt the economy. Hope I helped :)