请教OG-CR-Q171

A recent report determined that although only 3 percent of drivers on Maryland highways equipped their vehicles with radar detectors, 33 percent of all vehicles ticketed for exceeding the speed limit were equipped with them. Clearly, drivers who equip their vehicles with radar detectors are more likely to exceed the speed limit regularly than are drivers who do not.

The conclusion depends on which of the following assumptions?

A) Drivers who equip their vehicles with radar detectors are less likely to be ticketed for exceeding the speed limit than are drivers who do not.

B) Drivers who are ticketed for exceeding the speed limit are more likely to exceed the speed limit regularly than are drivers who are not ticketed.
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答案B，想不明白A为什么错。OG解释：A provide additional data that might be relevant to the conclusion, but if B is assumed, the additional data are unnecessary for drawing the conclusion. 感觉AB都行，从字面看A似乎与题干更接近（Drivers who equip ... than are drivers who do not），A还在B前,为何一定选B？请大家指教。