Which best describes the results of a case study?
it produces more reliable results than other methods because of its depth
its results are not generally applicable
it relies solely on secondary data analysis
all of the above

The results of a case study are not generally applicable.

Explanation:

A case study is a methodology within social science that focuses on one particular case. This methodology presents both advantages and disadvantages that are related with the results. Because the researcher concentrates solely on one case, the results can have a lot of depth and the researcher can have a deeper comprehension of it.

However, the results are also very particular, responding to the social, economical and political context as well as characteristics that are unique to that one case. Therefore, the researcher must make explicit that the results are not generally applicable to other cases.  

fir trees are found in areas with cooler climates. fir trees have needles for leaves and remain green year-round.

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).