DrSam Collects Data on How Often Strangers Approach One Another

Dr.Sam collects data on how often strangers approach one another at the park on weekend afternoons.One strength of this observational approach is that it:

A) occurs in a real-world setting.
B) involves a structured set of interview questions.
C) allows for a great deal of control over the observational setting.
D) shows how people behave under stress.