Final answer:
Jack's offending decreases after getting married, exemplifying the concepts of desistance and the Age-Graded Theory of Informal Social Control, which associates increases in social bonds with reductions in criminal behavior.
Step-by-step explanation:
According to Sampson and Laub, Jack's decrease in offending after getting married is an example of a concept known as desistance through social bonds, which is part of the Age-Graded Theory of Informal Social Control. This theory suggests that as individuals build stronger ties to society through life events such as marriage or employment, their risk of offending decreases because they have more to lose by engaging in criminal behavior. The formation of adult social bonds and responsibilities is seen as a critical mechanism in the process of desistance from crime.