________ involve using an experimental group that has already been exposed to a suspected causal agent, finding a controlled group that has not been exposed to the agent but matches the experimental group in all other relevant respects, and then tracking the two groups over time to determine a cause-and-effect relationship.
A. Randomized block designs
B. Nonrandomized retrospective studies
C. Nonrandomized prospective studies
D. Randomized double-blind trials
Answer: C
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