Nagpur's transport authority plans to increase bus frequency on a busy route by 40%, expecting this alone to raise ridership significantly enough to make the additional buses financially worthwhile. The plan assumes something about current demand on that route. Which of the following is a necessary assumption for the argument above to hold?

1. AThe route passes through several major markets in the city.
2. BBus fares on this route have not changed in the last two years.
3. CA significant number of potential riders on that route are currently avoiding the bus specifically because of long waiting times, not for other reasons like cost or route coverage.
4. DThe transport authority operates buses on over fifty routes citywide.

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