Which research question would be most appropriate for a four- to five-page research paper?

how successful have school uniforms been for schools in the united states?
does the use of school uniforms decrease violence in schools?
what style of school uniforms is most effective?
what percentage of schools have dropped mandatory school uniforms?

The prefix of the italicized word in the sentence is rather difficult

Along the sea-sands damp and brown the traveller hastens toward the town, what is the effect of the enjambment in these two lines? it emphasizes the idea that each line is a separate thought. it creates a rhyme scheme between the two lines. it encourages the reader to pause between the two lines. it strengthens the connection between the two lines.

Which option is the most relevant piece of evidence for this claim