Explanation:

- Deviance: Deviance involves actions or behaviors that violate societal norms or expected standards. Prostitution is often considered deviant because it challenges social norms concerning sexuality and legality.

- Secondary Institution: This refers to entities or practices that arise from primary institutions. They indirectly contribute to societal functioning but are not fundamental. Prostitution doesn't fit this description.

- Institutionalisation: This is the process by which a practice or organization becomes embedded within a culture or system. It’s unlikely that prostitution was the intended concept here.

- Adoption: This is the act of taking on practices or children as one’s own. It doesn't contextually align with prostitution.

Correct Answer: Option 1 - Deviance