Here's a problem to solve: Which of these serve as protective barriers along coastlines and are often destroyed when hit by a strong hurricane?

Among the 4 following options, which is the correct answer?

- A: the erosion of land along the coastline
 
- B: the buildup of dunes along the coast over time
 
- C: the new construction of buildings along the coastline
 
- D: the buildup of organic material from oil rigs along the coast
 