GMAT Critical Reasoning (CR) | Re: A manager at a local theme park has proposed doubling the

A manager at a local theme park has proposed doubling the number of attendants at the park's entrance gates, claiming the new attendants will alleviate line congestion. The manager reasons that, since the wait times at the entrance will be reduced from about thirty minutes to ten minutes, more people will visit the park, and the increased revenue will offset the cost of the extra attendants.

Which of the following statements, if true, provides the best evidence that the park manager's reasoning