Ocean is a body made of water, and Waves are the constantly-moving ridges that form on it. To keep the analogy exact, the desert equivalent needs to be a constantly-moving ridge formation, not just the material the desert is made of. A desert is made of sand, and wind sculpts that sand into constantly-moving ridges called dunes, dunes migrate across a desert over time the same way waves roll across an ocean.
Water and Sand describe the base material for each landscape, a different, more basic role than the one Waves plays; Brave carries no relevant meaning here. Only Sand dunes performs the same moving-formation role for a desert that waves perform for an ocean.
Therefore, the correct answer is Sand dunes.
In geography, landforms shaped by wind action are called aeolian features. The waves on an ocean's surface are one such feature, continuously built and reshaped by wind acting on water. The parallel feature for a desert is the landform continuously built and reshaped by wind acting on sand.
Sand dunes are the recognised wind-built landform of a desert, just as waves are the wind-built landform of an ocean.
Therefore, the correct answer is Sand dunes.