I think it is the 4th one, Not 100% sure.
<em /><u><em>"She did not understand what happened."
</em></u>It is a complete sentence since it has a subject (she) and a verb (understand), and is independent (i.e. doesn't require another clause to make sense<u><em>
</em></u>
Bobby talked about Baby Boomers
Alliteration is a rhetorical device that repeats the same sound at the beginning of words. "Bobby", "Baby", and "Boomers" all have the same "B" sound at the beginning.
