Fund manager: over the last five years, the various stock funds managed by our company increased on average by 7 percent more in value than the market as a whole annually. Furthermore, the performance of each particular stock fund has not varied much from one year to the next, and our few investment products other than stock funds have stayed even with the market. These results show the success of our company: each year, most of our investment products have increased in value more than the market.
The debater's argument is most vulnerable to criticism on which of these grounds?
【选项】
It takes for granted that if a certain average annual increase in value was obtained by each investment product, then each stock fund increased each year by approximately the same amount.
选项是否正确？