Outside of the Regular Large Desert Environments (E

Outside of the regular large desert environments (e.g.,the Sahara and the Gobi) ,sand dunes are found next to lakes and beaches.Why is that?

A) Wet or damp sand grains stick together more easily than dry ones.
B) Water waves,tides,or storms pile the sand up,which starts dunes.
C) There is ample supply of sand and strong onshore winds.
D) Near-shore vegetation help trap the sand,allowing large sand dunes to pile up.