The answer is the first one metaphor
A reasonable inference that one can make out of this poem is that you should not be worried about your fate, because at the end people are part of a generation which has its own struggles and at the end, people have to face their own destiny,being courageous, as the previous generations were and have been.
This is the reason why is possible to conclude that the two lines best linked to the theme are:
"Be comforted; the world is very old,
And generations pass, as they have passed"
A - Onomatopia - where the word is written like it sounds (example: buzz, tweet, grunt)
Assonance is the repetition of a vowel sound, alliteration is the same beginning sound (hog's howl) and rhyme is the same ending sounds (fat cat sat)
How to get the same as the one I have a great day and I will be a good time to get the same as the one I have a greater than the intended recipient you are
The answer would be the third option, c