Question

what can happen in extreme cases of urban sprawl? land prices get cheaper. cities may merge together. pollution will disappear.

Explanation:

Urban sprawl refers to the unplanned, low-density expansion of urban areas. In extreme cases, adjacent cities' expanding development can connect and merge into a single large urban agglomeration. Land prices typically rise in areas affected by sprawl due to development demand, and sprawl increases pollution (from more cars, construction, etc.), so the other options are incorrect.

Answer:

Cities may merge together.