In a study by Dai et al.(2011) ,they found that only police ______ and their reception of citizen voices were significant factors in reducing citizen disrespect and non-compliance.

A) age
B) demeanor
C) level of education
D) years of experience

The study by Dai et al. (2011) found that the demeanor of police officers, or their behavior and attitudes, was a significant factor in reducing citizen disrespect and non-compliance. None of the other options (age, level of education, and years of experience) were found to be significant factors in the study.