QUICK I NEED THAT A.S.A.P Great Sand Dunes National Park in Colorado is famous for its giant sand dunes. Sand dunes are landforms that are found in deserts and on beaches. Visitors to the park can surf down the dunes on sleds or boards.

After visiting the park with his family, Kerry decides to build a model of a sand dune. In addition to sand, what will he need to form the model?

A. ice
B. plants
C. water
D. wind