The main difference between longitudinal and cross-sectional research is in terms of

AThe frequency and timing of data collection ✓ Correct

BPrimary versus secondary data

CThe qualification of the researcher

DThe subject of study

Correct answer: (A) The frequency and timing of data collection

Explanation

Longitudinal and cross-sectional research differ mainly in the frequency and timing of data collection.

Primary versus secondary data is a separate source distinction.

The researcher's qualification is irrelevant to this contrast.

The subject of study does not define either design.

Longitudinal collects data repeatedly across time.

Cross-sectional collects data once across different groups.

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