Reading-Structure-MyTest-02

Which COMPETENCY was used to compose this question?

I wandered lonely as a cloud
That floats on high o’er vales and hills,
(1) When all at once I saw a crowd,
(2) A host, of golden daffodils;

Beside the lake, beneath the trees,
Fluttering and dancing in the breeze


What is the relationship between highlighted lines?