We can actually deduce here that the effect a refrain have in a formal poem is: B. It creates a pattern of rhyming words that stick in a readers mind.
What is poem?
A poem is actually known to be a written work of art that is written in a particular style with deep rhetorical meanings. Poems are written to convey certain issues.
Thus, we can see here that refrain in a formal poem actually creates a pattern of rhyming words that stick in a readers mind.
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