Which of the following is a comparison that this poem makes?
Music, When Soft Voices Die (To--)
by Percy Bysshe Shelley

Music, when soft voices die,
Vibrates in the memory.--
Odors, when sweet violets sicken,
Live within the sense they quicken.--

Rose leaves, when the rose is dead,
Are heaped for the beloved's bed--
And so thy thoughts, when thou art gone,
Love itself shall slumber on.

a) It compares music to memories, which keep it alive in the form of vibrations.
b) It compares the beloved's thoughts to rose leaves that live longer than the rose itself.
c) It compares the intensity of the beloved to the lingering fragrance of violets.
d) It compares human mortality to the inevitable need to sleep at night.
e) It compares the beloved's nature to delicate things like sweet violets and rose petals.