What is longitudinal research? A. a form of research wherein you interview, test, and observe a group of individuals over a long period of time.

B. a form of research wherein you interview, test, and observe one person over a short period of time

C. statistical research

D. research done lying down.

A

Explanation:

A longitudinal study is a type of correlational research study that involves looking at variables over an extended period of time.

A

Explanation:

A longitudinal study is observational, researchers do not interfere the subjects. In a longitudinal study, researchers make several observations of the same subjects over a long period of time, unlike a cross sectional one, which is made over a short period of time.

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