Which of the following best describes Fredric Thrasher's theory of gang formation, which he developed in Chicago in the 1920s? Select one: a. Gangs form when groups of young men from different cultural traditions struggle to find status and recognition in turbulent social conditions. O b. Gangs form when groups of young men perform cost-benefit analysis and recognize that it is to their mutual self-interest to join forces and gain strength in numbers. O c. Gangs form when people are attracted to one another by biochemical pheromones that cause distinct, but often unnoticeable, differences in scent. O d. Gangs form when children grow up without both of their biological parents in the home, compelling them to form attachments with external others