Answer
(e)
Work Step by Step
A retrospective study looks backward in time, using existing data or historical exposure to assess outcomes.
Comparing humans raised during DDT use (treatment group) with those raised after its ban (control group) allows researchers to evaluate long-term effects of endocrine disruptors like DDT.
This setup fits the retrospective model: the exposure has already occurred, and the outcomes (e.g., reproductive health, hormone-related conditions) can be analyzed using medical records or surveys.
The answer is (e).
