What is the purpose of the Barrier Islands? to provide a food source for local residents
to harvest energy sources from the ocean
to protect the coast by blocking wind, water and sand
to create a haven for immigrants

How do the narrow ribbons of sand that line the Atlantic and Gulf coasts ... Barrier islands protect about 10 percent of coastlines worldwide.Such as reducing coastal erosion, purifying water and providing habitat for fish and birds. New islands can form out in the ocean, either because local sea level.

To protect the coast by blocking wind, water and sand

Explanation:

c is the newer have a great day

a would be the answer