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.
ears?
didn't give me much to work with so I'm not sure
Answer: A bank uses the resources of many customers to help finance loans to a few.
Explanation: A collective immunity is like a group of people being immune. And if all those people get immunized, then the people who can't physically get immunized will be okay. Now think of the collective immunity as a bunch of people that keep their money in a bank. Someone needs a loan from that bank because they don't have enough money, the "collective group" of people are helping that person out.
Friendship is a theme best represented within this passage.
B) Yours Truly is the correct way to write in a business letter.