Spanish Dancer
by Rainer Maria Rilke
 As on all its sides a kitchen-match darts white
 flickering tongues before it bursts into flame:
 with the audience around her, quickened, hot,
 her dance begins to flicker in the dark room.
5 And all at once it is completely fire.
 One upward glance and she ignites her hair
 and, whirling faster and faster, fans her dress
 into passionate flames, till it becomes a furnace
 from which, like startled rattlesnakes, the long
10 naked arms uncoil, aroused and clicking.
 And then: as if the fire were too tight
 around her body, she takes and flings it out
 haughtily, with an imperious gesture,
 and watches: it lies raging on the floor,
15 still blazing up, and the flames refuse to die -
 Till, moving with total confidence and a sweet
 exultant smile, she looks up finally
 and stamps it out with powerful small feet.
What is the meaning of imperious as it is used in Line 13?
compulsory
commanding
insulting
assaultive