The increased subsidence of southern Louisiana, from 3 ft to 12 ft every 100 years, contributed to the effects of Hurricane Katrina.

Which of the following is not a cause of this subsidence?

A)

the extraction of groundwater

B)

the extraction of oil and gas

C)

the loss of freshwater wetlands

D)

the lack of tall trees such as cypress

E)

the practice of building on hilly areas