Final answer:
The situation with Bob being unable to leave his gang due to strong connections with its members illustrates the concept of 'Social control,' which is about the societal forces that regulate individuals' behaviors and enforce norms.
Step-by-step explanation:
The scenario with Bob, who is unable to leave his street gang despite his desire for a college education, best illustrates the concept of A) Social control. In social studies, particularly sociology, social control refers to the regulation and enforcement of norms within a society. Bob's strong sense of connection with his gang members exemplifies this concept as his ties to the gang are inhibiting his ability to pursue personal ambitions like higher education. His sense of loyalty and fear of disapproval or retaliation act as agents of social control, maintaining his adherence to the gang's norms and behaviors instead of allowing him to follow his individual goals.