Answer: It decreases the amount of farmland that is available for growing crops.
Step-by-step explanation:
Urban sprawl leads to the construction of buildings and roads to accommodate the growing human population. This is usually done with little urban planning so it ends up making towns and cities unsustainable from an environmental point of view.
The constructions of urban sprawl takes land from natural and forest areas which are areas that could have been used for farming. In building these urban areas therefore, farmland is decreased.