Why do sandy beaches form at many sea shores?

A.
Sunlight reacts with organic content of coastal soil to form sand.
B.
Calcite in coastal soil is dried and bleached in the sun to form sand.
C.
Waves deposit fine sediments from weathered coastal rocks on the shore.
D.
Sand is produced when sea salt and crushed shells mix with coastal soil.
E.
The iron on sea shores reacts with oxygen to form yellow sand.