He wishes for the Cloths of Heaven, W.B. Yeats

Had I the heaven's embroidered cloths,
Enwrought with golden and silver light,
The blue and the dim and the dark cloths
Of night and light and the half-light,

I would spread the cloths under your feet:
But I, being poor, have only my dreams;
I have spread my dreams under your feet;
Tread softly because you tread on my dreams.


The line "But I, being poor, have only my dreams;" is an example of:
A) Assonance
B) Sarcasm
c) Metaphor
d) Irony
E) Apostrophe