Tossing their heads in sprightly dance is personification (giving a nonhuman thing human-like traits) so this is your answer. None of the others options are in the poem anyways even though all the other options are figurative language as well.
Identify the 4 elements of rhetoric. Start your analysis by taking note of the following rhetorical elements: Describe the rhetorical appeals. Analyze. Evaluate. State your thesis. Organize your ideas and evidence.