Which of the Following Nonreactive Measures Is an Example of Observation

Which of the following nonreactive measures is an example of observation?

A) Examining children’s toys at a daycare to determine which ones are most popular as indicated by their wear and tear
B) Examining garbage bins in a neighbourhood to determine nutritional habits
C) Examining marriage records in an archive in order to compare marriage patterns among different communities over time
D) An examination of high school yearbooks to compare the high school activities of those who had psychological problems in later life versus those who did not
E) Counting and comparing the number of men and women who come to a complete stop at a stop sign to determine driving habits by gender