To reduce the possibility of another vietnam, congress passed the .

 The War Powers Resolution

Detail:

Passed in 1973 over the veto of President Richard Nixon, the War Powers Resolution (its official name) blocks presidents from continuing the pursuance of a war without Congress's approval.  This was a way of curtailing the authority of presidents to increase involvement in the war, which had begun with the Gulf of Tonkin Resolution during the Johnson presidency.

The War Powers Resolution requires the President of the United States to notify Congress within 48 hours of committing armed forces to any military action. Armed forces cannot remain deployed for more than 60 days (plus a 30-day withdrawal period), unless Congress authorizes the use of military force or enacts a declaration of war.

In practice, since its passage, the War Powers Resolution has at times   been sidestepped by presidents.  The US Constitution leaves some tension in place between the legislative and executive branch when it comes to the country's involvement in war.  Article I of the Constitution gives Congress the power to declare war.  But Article II names the President the Commander-in-Chief, and presidents frequently have understood that role as containing the authority to deploy US forces without first getting congressional approval.  The War Powers Resolution has been an ongoing point of controversy, as US forces have been sent into all sorts of conflict zones in the 21st century without formal declarations of war.

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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).