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when a researcher tests several groups of people at the same time each group at a different age, he is conducting a(n) ______ study

When a researcher tests several groups of people at the same time each group at a different age, he is conducting a(n) ______ study.

[A] Sequential

[B] Cross-sectional

[C] Longitudinal

[D] Observational

Answer & Explanation
Option: [B]