In order to study the development of relationships, dr. rajiv carefully observed and recorded patterns of verbal and nonverbal behaviors among men and women in singles bars. which research method did dr. rajiv employ?

I believe the answer is: naturalistic observation

naturalistic observation refers to a form of research which use direct observation to one's surrounding environment as the main data collecting method. This type of research is being done without doing any data manipulation using control group so the researchers could obtain the results that represent the actual condition within the nature.

even though you have attached neither the chart nor the generalizations, i have located them online. the right answer is d, since they are asking you about a generalization. you can only infer from the chart that between 2008 and 2009 the number of employed workers decreased significantly (from over 115 millions to 107 millions approximately), which signals some type of economic crisis.