One of the Differences Noted Between the Various Cohort Studies

One of the differences noted between the various cohort studies is that

A) some rely on official records while others use self-report data
B) some focus on violent offending while others focus on property offenses
C) some emphasize the onset of criminal careers and others emphasize desistance from them
D) some find chronic offending rates low as 5.8% and others as high as 9.5% in a cohort