Wordsworth's theory is that poetry is the spontaneous overflow of
good ideas
moral values
strong rhythm
powerful feelings

The best and most correct answer among the choices provided by the question is the fourth choice ":powerful feelings"

He describes poetry as the spontaneous overflow of emotions. Poetry is not dependent upon rhetorical and literary devices, but is the free expression of the poet's thought and feeling. ... For Wordsworth, the important thing was the emotion aroused by the poem, not the poem itself (hence his lukewarm regard for form).

I hope my answer has come to your help. God bless and have a nice day ahead!