All of the answers are correct.
The value of the mark after World War I plunged dramatically due to German hyperinflation. Germany printed literally tons of money to pay off their massive war debts to Britain and France, devaluing money until one mark was worth about one-billionth of a United States cent.
The economic expansion took place in the 1900s in the United States of America. The GDP of the country increased continuously for 10 years. The jobs were still less and it was observed that financial and service sectors boomed more than that of the manufacturers. In 1194, jobs were also created and this also led to further economic development. The amount of wealth generated was very high and poverty rates decreased.
The green revolution is when farmers and scientists developed new methods and techniques to make plants grow faster. They also discovered new strains and compounds to replace plants that take longer to grow, with faster and more effective plants. Because of the green revolution, plants may grow at a faster rate with less water or sunlight given to them. It was the scientific improvement to earths natural way of providing resources.