I think it would be a because you don't use diagrams to show graphs because they are themselves a diagram
<span>This is an analogy that you need to complete in order to see what the final word should be. So, exciting is an adjective that describes the noun thrill. So, in order to finish the analogy, you need a noun that the adjective difficult refers to. That noun could be ordeal, hardship, trouble, torment, torture, etc. You need a word that means "something difficult," so any of those words could be the correct answer.</span>
If you are trying to remember information that you are reading, you should be an "active" reader, who pays attention to the words and thinks about connections that may occur.
The alliteration is that she's telling you how her life was and how some days it was good and other days it wan't so good. She uses alliteration because she wants her reader to know how days were during her life. Although she wasn't a slave she still had a hard life and the alliteration she uses represents that and how she wishes things were easier and she's saying that life was hard for folks back then. I hope this helps.