Respuesta :
Answer:A. Longitudinal design
Explanation: Longitudinal study is a study used to observe relationship that occurs between variables over a period of time excluding their background information.
This observational study observes a group of people who share similarities or similar characteristics , following them over an extended period. Data collection is taken from the outset and get repeated over the length of time in this way researchers are able to see how variables change over time.
Like studying how exercise affect a group of people all over the age of 45 to 50 and observing them over a period of a year this would be a Longitudinal study.
Longitudinal design is the descriptive research that involves tracking the responses of the same sample of respondents over​ time.
Longitudinal design study :
- It is a type of correlation research study.
- Here, the researchers examines the same individuals repeatedly to detect for any changes which might occur over a period of time.
- It is observational study, where the researcher does not interfere with their subjects but keep a track of the sample.
Learn More :
https://brainly.com/question/21324899
https://brainly.com/question/12976553