<span>A. demand
Demand is t</span><span>he general willingness of consumers to purchase a product at various prices.</span>
Answer:
Railroads
Explanation:
Unlike airplanes and other forms of road transportation that their routes can be altered, have shortcuts, and other routes, railroads are fixed to the ground during construction and hence cannot be altered, hence they operate on fixed routes. Also railroads operate on fixed schedules, except for cases of delays, which seldom happens.
