I agree with Skillo as well that you cannot simply perform a dance, however, i have seen a few movement pieces that didn't include dialogue and one in particular that got full marks, so as long as your piece has clear dramatic meaning, focus, tension integrity, etc., it can still achieve high marks without dialogue.
However, you will probably be able to achieve the above criteria more easily with the use of dialogue to make it more clear what you are trying to convey, even if the words are minimal.
The girl i mentioned who got full marks used some narration over her movement piece, and a little music, but the rest was simply movement. She did it based on the apple, the story of eve and of snow white. Because she had clarity and a good structure, the examiners saw the meaning behind it, saw that it was original and well rehearsed, and thus had no choice than to give it full marks.
If you are sure you can do it well, go for it, otherwise, choose carefully.
xx