Kevin and Cheryl had completed their earliest day of the naturalistic observation of adolescents at local high school. As they discussed their experiences throughout the day, they found that they were both concerned regarding the differentiation their presence in classrooms made on adolescent behaviour. This is a significant question since, in truly naturalistic research, researchers must
A. be unobtrusive
B. manipulate independent variable
C. be seen and interact with subjects
D. not change situation
E. operationally define variables
F. record the observed variables which are part of study Apply as many