The desert today / be characterized / 700 - foot - high dunes / giant sand mountains

A. The desert today is characterized with 700 - foot - high dunes but giant sand mountains.

B. The desert today is characterized by 700 - foot - high dunes and giant sand mountains.

C. The desert today is characterized by 700 - foot - high dunes and however giant sand mountains.

D. The desert today which is characterized by 700 - foot - high dunes and giant sand mountains.