GMAT Critical Reasoning (CR) | Re: RATT RACE: Five years ago

Five years ago, only every fifth resident of Korovia owned a credit card. Since then, however, credit card penetration in urban Korovia has increased rapidly as a result of strong telemarketing campaigns. Credit card companies now wish to maintain the present growth rate by increasing their investments in telemarketing campaigns.
Which of the following, if true, most strongly argues that the strategy, if adopted, would not achieve its goal?

(A)Credit card companies have more vacancies for telemarketers