What Is Probably the Least Expensive Approach for Avoiding Shoreline

What is probably the least expensive approach for avoiding shoreline hazards?

A) bringing in sand to replenish what is lost to storms
B) using private insurance money to rebuild houses destroyed by erosion and waves
C) using federal disaster money to rebuild houses destroyed by erosion and waves
D) forbid the building of houses or other structures in high-risk areas
E) building up the land level so communities, such as New Orleans, are above sea level