The answer is A. Demoralizing the North with a victory on northern soil.
Answer:
Muslim merchants migrated east to the land of Tang, Changan and other Chinese cities, Some merchants returned to their lands but others remained in those lands with the Tang emperor's permission and also allowed them to marry Chinese women. In Islam, Muslim children were also Muslims and the religion in the East rose.
Key basic industries, such as railroads, textiles, and steel had barely made a profit. Railroads lost business to new forms of transportation (trucks, buses, and private automobiles, for instance). Coal mining was especially hard-hit, in part due to stiff competition from new forms of energy, including hydroelectric power, fuel oil, and natural gas.
They wanted to gain more wealth in the future profit, therefore the answer is D.
