A study in which a group of participants is observed and measured over a period of time refers to

ALongitudinal research ✓ Correct

BArchival research

CCross-sectional research

DCorrelational research

Correct answer: (A) Longitudinal research

Explanation

Longitudinal research observes and measures the same group repeatedly over an extended period.

It tracks change and development across time within the same participants.

Archival research analyses existing records rather than fresh observation.

Cross-sectional research studies different groups at a single point in time.

Correlational research measures associations without a time dimension being essential.

Panel and cohort studies are common longitudinal designs.

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