The Bulk of the Research on the Relationship Between Delinquent

The bulk of the research on the relationship between delinquent peer associations and delinquency suggests that:

A) the onset of delinquency most often predates interaction with delinquent peers
B) interaction with delinquent peers typically predates the onset of delinquency
C) once delinquent behavior has begun, interaction with delinquent peers increases the seriousness and frequency of delinquency
D) a and c
E) b and c