Final answer:
1) The messages of mass media are the least likely to reduce or prevent risky behaviors in comparison to the direct influences of family, positive role models, and a supportive social network, which have a more significant impact on individual behaviors.
Step-by-step explanation:
The factor least likely to reduce or prevent risky behaviors among adolescents is 1) the messages of mass media.
Unlike direct socializing agents such as family members, positive role models, and a supportive social network, mass media tends to distribute impersonal information and may not have as strong an influence on individual behaviors compared to the guidance and support provided by close personal relationships.
It is not as clear, despite ongoing research, how much influence mass media has in comparison to the other agents of socialization like family and peers that are known to directly guide and shape behavior.
Family is frequently cited as the earliest and most influential agent of socialization, a role that is often more influential than mass media in shaping attitudes and behaviors.
Additionally, peer influence, especially during adolescence, can be a strong force, but if the peer network encourages positive behavior, it can act as a support system rather than a risk factor.