Even Though Many Psychologists Focus on One Level of Analysis

Even though many psychologists focus on one level of analysis when conducting their research,it is also true that

A) the group level of analysis is the least applicable to the field of psychology, and more accurately fits with sociology.
B) the brain level of analysis is the most popular and most likely to produce research that is funded and published.
C) psychology as a field is really about the person level of analysis, and the other two levels of analysis add little to our understanding of human nature.
D) in our daily lives, all three levels of analysis are operating and interacting.