What is setting? please I need to know

What is the effect of the haiku structure on this poem?   how does the line structure describe the subject(s)?   and how does a haiku compare to a rhyming and longer poem in terms of its effect on you as a reader?

Which sentence contains an allusion? a. pamela and her twin are as alike as two peas in a pod, and they do everything together. b. pamela has a weakness for chocolates, which she says she's had since early childhood. c. pamela's face was as white as a ghost when she learned the shocking news about her brother. d. pamela's backyard looks like the garden of eden, with dozens of green and lush plants. e. pamela found herself trapped between a rock and a hard place, and she didn't know what to do.

Which statement best describes an example of irony from chapters 22 and 23 of the adventures of huckleberry finn