Answer:
Corresponds to descriptive observational study
Step-by-step explanation:
In this case, surveys were conducted and cases were observed after the years had elapsed. More precisely, there is talk of a descriptive population study. If it were an analytical observational study, we would have to perform a sampling, have controls, perform different tests on the sample under analysis. In the case of the problem, the prevalence of diabetes disease and incidence were studied, depending on the "happiness" factor.