Critical Reasoning (CR) | Re: A billboard company executive recently announced an increase in its

A billboard company executive recently announced an increase in its billboard rental rates by 5 to 10 percent next year over rates this year and expects other billboard companies to follow suit. The executive argued that despite this increase, advertisers will continue to profit from billboard advertising, and so billboard rentals will be no harder to secure than thisyear.

Which one of the following, if true, would most support the billboard company's executive's argument?

a) The number of