What does the sunflower symbolize in William Blake's "Ah! Sunflower"?

Ah! Sunflower

by William Blake
Ah, sunflower, weary of time,
Who countest the steps of the sun;
Seeking after that sweet golden clime
Where the traveller's journey is done;

Where the Youth pined away with desire,
And the pale virgin shrouded in snow,
Arise from their graves, and aspire
Where my Sunflower wishes to go!

A.
a person who is fatigued by daily responsibilities
B.
a person yearning for spiritual or mental enlightenment
C.
a person who finds beauty in the natural world
D.
a person no longer young and thinking about life
E.
a person contemplating the meaning of a small flower