If you wanted to use an interrupted time series design to examine if lowering the legal limit of blood alcohol level (BAL)for driving under the influence affected the frequency of arrests,you would

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An interrupted time series design involves measuring data points regularly over an extended period of time both before and after an intervention, in this case, the law lowering the legal limit of BAL for driving under the influence. B is incorrect because it only measures two time points, which is not enough to establish whether the law had a long-term impact. A is incorrect because it only compares two states without controlling for other factors that might explain differences in frequency of arrests. D is incorrect because it does not measure the impact of the law, but instead attempts to establish a correlation between individual alcohol consumption and arrest frequency.

If You Wanted to Use an Interrupted Time Series Design