What were the sunflowers doing?

Directions: Read the following passage and answer the question that follows.

I wandered lonely as a cloud,
That floats high over valleys and hills,
When all of a sudden I saw a crowd,
A host, of sunflowers,
Beside the lake, beneath the trees,
Fluttering and dancing in the breeze.
They stretched in never ending line,
Along the margin of a bay,
Ten thousand saw I at a glance,
Tossing their heads in blooming dance.