Which sentence supports the idea that beach erosion is a natural act? "Beach erosion is the transfer of sediment from the beach to sandbars that lie not too far offshore." (paragraph 2) "Reservoirs of sand are located farther up shore from the beach ." ( paragraph 2) "These common acts of nature are what leave beaches with less sand ." ( paragraph 2) "Dunes are an important part of the natural beach system " ( raph 2)