What is the relationship between china's continued economic expansion and its ruling authorities?

China’s economic expansion, also known as “the Opening Up of China”, and its ruling authorities seem to have a correlating relationship. When China is open to trade, it is most often successful economically.

Prior to the 19th century, China had one of the world’s largest and strongest economies. After a decline in the nineteenth century during the Qing Dynasty reign (due to internal conflict and the Opium Wars), China came back full force in the early 1930’s. Towards the mid 1900’s the Communist Party made reforms, or changes, to the economy in the forms of collectivism of agriculture, opening to trade and foreign investment with other nations, and allowing entrepreneurs to start businesses; contracting out state owned industry and lifting price controls. This has allowed for large success and modern growth into the modern-day.  

marginal cost is a microeconomic measure that us to evaluate the extent to which the level of production of a good is sustainable in accounting, that is, to how many quantities the company plans to profit from the production of the good.

the concept of marginal cost is simple, it means the cost of producing one more item. for example, in the case of pies, the marginal cost is the cost of producing one more pie than those that have already been produced.

it is important to understand that productive activity influences marginal cost. the marginal cost of some goods can be very high, while others may be insignificant. for example, the marginal cost of producing an extra plane is very high. already the marginal cost of a water company to provide 1l more water is derisory.

in the case of pies, the cost involves the inputs, the labor and the fixed cost, which involves the fixed space of the bakery. the level of production initially has the marginal cost decreasing because there is space and manpower available. however, to produce more you have to hire more workers and buy more inputs. if physical space is limited, workers will conflict with places, inputs and their productivity will decrease, meaning there is an optimum point of production for each level of space and manpower. from this point on, the productivity of the workers will be getting smaller because of lack of space, so that the marginal cost of producing one more pie will be increasing. so, although you have not posted the chart, but if you have the answer, you can see that my explanation goes according to the marginal cost curve that will increase from the 4th pie, answer (c).

answer; i do believe that its(gestation,suction-aspiration or vacuum aspiration;