Why do sand dunes reduce erosion a. they cause the tides to go higher. b. they cause waves to break offshore. c. the roots of dune plants hold sand in place. d. they prevent people from walking on the beach

Answer;

B. They cause waves to break offshore.

Explanation;Sand dunes are landforms that develop where there is an adequate supply of sand and where prevailing winds are strong enough for sand movement to occur.Sand dunes are a natural barrier to the destructive forces of wind and waves. They are first line of defense against coastal storms and beach erosion. They absorb the impact of storm surge and high waves, preventing or delaying flooding of inland areas and damage to inland structures.