For the next class?
Well of course, the student can carefully read the syllabus next time.
Is the question worded like this?
Night time because she may be having trouble sleeping<span />
Answer:
A and B are the same on the first picture!!
The answer to this question is: Documents
Researchers will use these documents to gather data that will be analyzed in order to find a correlation between a certain occurrence with another.
For example, researchers could gather up the number of high school dropouts with criminal shootings to find out whether there is a correlation between the two.