Much of the City of New Orleans Is Below Sea

Multiple Choice

Much of the city of New Orleans is below sea level, yet it was not an ocean when the city was first settled. How did it get below sea level?

A) Oil production withdrew oil and produced land subsidence.
B) The area was dredged to build levees, and so it was left below sea level.
C) Drainage canals and groundwater withdrawal produced subsidence that dropped the land below sea level.
D) Sea level is just rising.