Answer:
Option C “the reason the data are collected”
Step-by-step explanation:
The epidemiology studies based on four criteria for utility of data are
1-Nature of data
2-Availability of the data
3-Completeness of data and
4- value and limitation.
Value and limitation of data means that some factors may limit the data usefulness like incomplete information or repetition and duplicate data while Nature of data means the data source which affect the statistical analysis. Availability of data means the presence or access of data to investigators.