哪种研究方法会根据推广活动的目标客户定向将人群分为两组，其中一组接触过广告，而另一组则未接触过广告？

The correct answer is the "control group and experimental group comparison method." This research design is fundamental in marketing measurement because it allows marketers to isolate the impact of an advertising campaign. The experimental group is exposed to the ad, while the control group is not, and both groups are otherwise similar based on targeting criteria. By comparing the outcomes (e.g., conversions, brand lift) between these two groups, marketers can attribute changes directly to the advertising exposure. "Double-blind method" and "blind method and exposure method" are related to blinding in research, primarily used to prevent bias from participants or researchers knowing who received a treatment. While important in some studies, they don't directly describe the core group division for ad exposure. The "scientific method" is a broad approach to inquiry, not a specific research design for comparing ad exposure.