Which is the most accurate description of rapid urbanization in mexico and brazil?

The answer is Shantytowns (slums) and squatter neighborhoods have sprung up, housing millions of people and often lacking water, electricity and proper sanitation in both Mexico and Brazil.

It explains the whole thing on pages 314-315 in your text book, it also helps rule out the rest of the other options.

c.) the country needed a stronger central government.