题目选项分析

The TJ-700 and the Beta Turbomax are two models of cars of different manufacturers. These two models have almost identical specifications and features, and they sell for almost the same price. Both were introduced on the market five years ago, and each year, the respective manufacturers spend about the same amount in advertising. In the past five year, the total number of TJ-700's sold is about 80% greater than the total number of Beta Turbomax's sold. Clearly, the advertising firm that created TJ-700 ads created much more effective ads than the firm that created Beta Turbomax ads.

In evaluating the argument, it would be most useful to know which of the following?

【选项】Whether buyers of the TJ-700 and the Beta Turbomax reported being familiar with the ads of these cars.