Why did the chinese rebuild the great wall in the 1400s a. to keep merchants and traders from exporting chinese goods b. to keep out mongolian invaders from the north c. to keep out invaders from the japanese islands d. to keep peasants employed and content

The answer is B. To keep out Mongolian invaders from the north.

Explanation:

the graphs indicate that few people in bolivia work in industry, as that is the least expressive sector shown in the respective graphic.

demand is the need and oportunity to buy a given good or service.