Ok so far so good:) but what is the question here?
Answer:
B. The data were collected in a short time frame, which does not reveal full-year trends.
Explanation:
Short time frame would affect the conclusion on the major problems faced in 2017 since it may not reveal all the data required to make conclusion on the major or most important problem faced in year 2017. For example if data to make this conclusion is collected over a 3 month period in 2017, it is likely to not be representative of full year data trends that will help to make necessary conclusions on problems faced in year 2017
Try researching it !
There are tons of other resources.
I just don't want you to waste your precious time waiting here when someone won't answer :)
