Read the excerpt below and answer the question.

With a glance she sets her hair ablaze
and whirls suddenly with daring art
her whole dress into this fiery rapture,
out of which, like startled snakes,
her bare arms stretch, alive and clacking.

In this excerpt from “Spanish Dancer,” Rilke’s comparison of the dancer’s arms to snakes is an example of _____.

a. alliteration
b. analogy
c. metaphor
d. simile