Areas such as the san joaquin valley and mexico city have experienced subsidence because a of urban growth that made the area sink b groundwater was overpumped c of a drought that lasted decades d the main rivers were dammed e the sediments were all clay

The answer is b) groundwater was overpumped

As population in Mexico City and the San Joaquin Valley skyrocketed, the demand for water also increased.

Mexico City was once the most populated city on earth and that created a lot of burden on the cities infrastructure including the water supply.

The groundwater was over pumped leading to huge problems for millions of people.

If u can translate that to english i will surely you!