What type of figurative language is in bold in the poem below?
"Who Has Seen the Wind?"
by Christina Rossetti

Who has seen the wind?
Neither I nor you:
But when the leaves hang trembling,
The wind is passing through.

Who has seen the wind?
Neither you nor I:
But when the trees bow down their heads,
The wind is passing by.

personification
alliteration
allusion
simile
foreshadowing