Answer:
The answer is: A. Cross-sectional research analyzes the same subjects over a period of time.
Explanation:
Cross-sectional research is a type of observational study. It is characterized for studying one or more populations in a single point in time, it can be used to compare variables across groups, but it does not analyze the same subjects over a period of time, this would be a longitudinal research.
In a cross-sectional research, the data is collected during that specific point in time, and it is also called cross-sectional data.
