structure
This is process of elimination. Alliteration is the repetition of sounds at the beginning of a group of words. For example, Peter Piper picked a peck of purple peppers. Rhyme is when words have similar ending sounds. For example, around-bound, jump-bump, caught-hot. A simile is a comparison between two things using like or as. For example, the sun was like a golden medallion. None of these are correct because the numbers can't be a simile and their names don't repeat sounds. Structure is all that is left.
