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Researchers divided a group of people on the basis of their smoking status (smokers and non-smokers) and followed them for 20 years to see if they developed lung cancer.This is an exampleof what type of epidemiological research design :a.Cross-sectionalb.Cohortc.Case-controld.Retrospective

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Answer:

A) Cross sectional research

Explanation: Cross sectional research usually involves

different groups of people who differ in the variable of interest but share other characteristics, such as socioeconomic status, educational background, and ethnicity. Cross-sectional research studies are often used by researchers studying developmental psychology. Like in this case of smokers

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