Topic: Interchange of Parts of Speech,

Best Answer Explained in Below-:

The correct adjective form of "prevention" is "preventive" (Option C). Here's why:

1. **Definition and Usage**: "Preventive" is derived directly from the word "prevent," which means to stop something from happening. As an adjective, it describes actions, measures, or strategies that aim to avert negative outcomes. For instance, preventive healthcare techniques, such as vaccinations or screenings, are designed to prevent diseases before they arise.

2. **Comparative Analysis**: The other options do not correctly serve as adjectives that directly relate to "prevention":
- **Prevent (A)**: This is the base verb form, not an adjective. It indicates the action of stopping something from happening.
- **Preventable (B)**: While this term describes something that can be prevented, it is a derivative of "prevent" rather than a direct adaptation from "prevention."
- **Preventing (D)**: This is a present participle form that serves as a verbal adjective but is not specifically linked to the noun "prevention."

In summary, "preventive" is the most precise adjective to denote measures related directly to the concept of prevention, effectively capturing the essence of actions taken to avert problems before they occur.