The Great Wall of China was built, in part,

The Great Wall of China was constructed from the 7th Century.

Explanation:

BC by the Chu State and lasted until 1878 in the Qing Dynasty. The most remaining we see today was built in the Ming Dynasty about 600 years ago.

the correct answer is ) possibility.

demonstrating opportunity cost is done through production possibility.

the opportunity cost can be demonstrated using the production possibility frontier or curve. this graphic shows the total number of possibilities for two products when we have the resources needed and used in an efficient manner. the main resources could be money, labor, and technology. the curve shows that the production of one good increases when the production of the othe