Sociologist Terry Williams finds that to become a successful drug dealer, youth must learn a number of skills: pleasing the boss, meeting goals, and getting along with associates. These specific findings support:. a. labeling theory.
b. differential association.
c. structural strain.
d. the constructionist approach.

differential association..b

b). Differential association.

Explanation:

'Differential Association' theory describes that an individual learns a criminal ideology or behavior through his/her communication with the people around them in a similar manner he/she learns the rules or laws of the society. When an individual interacts frequently with people possessing criminal mindsets or purposes, it is more likely that he/she will learn the tactics, attitudes, and techniques of criminal behavior and no wonder, if he/she might commit something criminal. In the given scenario as well, Terry Williams learned such behavior and skills as a result of his interaction with the people around him that helped him eventually to turn into a drug dealer(criminal behavior) as learned that attitude and techniques required to pursue this crime.

answer; reactive is your answer; good luck