The correct answer is option c. Cohort study
In cohort study, it include find out of exposure associated to a disease condition. The data collected by comparing two group which one is expose to the risk factor and the other group are free from it.
The other options are wrong because for control trial there is need to administered intervention during the research study, cohort study is done under longitudinal and it cannot be done by interview method. Cross section study also do not include devision of two group.
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