Allusion is illustrated through the entire poem.
Allusion is an brief and indirect reference to a place, person, thing, or idea of historical, culture, political significance, or literary.
Furthermore allusion doesn't describe in detail the person or thing it refers to.
Hope I helped ;)
In the followoing sentence,"Seasons are celebrations. A year's a Ferris wheel. Both honor our world's habit of spinning 'round a star. " In the first line of this poem the poet id using the figurative language called a metaphor because he is making a direct comparison between two things. So your answer would be B, metaphor.
Hope this helps! If you have any other questions or would like further explanation just let me know! :)
