Final answer:
The explanation for Cade's behavior change is 'Increased propensity and opportunity,' due to both his age-related risk-taking tendencies and the new social environment that allows frequent marijuana use.
Step-by-step explanation:
The best possible explanation for Cade's behavior change after moving out of his parents' house would be Increased propensity and opportunity. This suggests that Cade has both a greater inclination toward risk-taking behavior, which is common in adolescents due to potential evolutionary benefits, and more opportunities to engage in such behavior now that he is living on his own with fewer restrictions. The environment with roommates who are always having parties could provide both the social setting and the opportunity to use marijuana more frequently. Additionally, changing public attitudes and the movement toward decriminalization may affect perceptions and behaviors surrounding marijuana use. [Becker, 1963; Daniller, 2019]