Land subsidence is a significant problem in which Latin American city?

The sinking of the soil in Mexico City is one of the biggest engineering problems any city has faced, anywhere," said Ismael Herrera Revilla, a mathematics professor at the National Autonomous University who led a binational scientific panel in a five-year study of the city's water crisis.

i would say d tho   ctfvygbuhinjmlk

answer; i believe the correct answer is (crops);