When the state approved stronger penalties for drunk driving, including the automatic suspension of driving privileges, the number of highway deaths related to drunk driving decreased. This observation suggests which kind of social research?

Evaluation

Explanation:

Evaluation research: The term evaluation research is referred to as the phenomenon which is being utilized to describe the influence of a particular social intervention. It is therefore used to analyze the influence of a specific program based on a few social problems that the program tries to figure out.

Types of evaluation:

1. Process evaluation.

2. Impact evaluation.

3. Outcome evaluation.

4. Summative evaluation.

In the question above, the given observation suggests evaluation kind of social research.