Ruby's Breakfast

I should be a private eye, and not one with a sty... Cause I put 2 and 3 together, Oh, I was being so very clever! My Sherlock mind, it did deduce, From clues she left,some too loose... Just what her choice would be.... At least I could clearly see... Not donuts and hot tea... Bacon and eggs? Naw...to easy.... Oatmeal?... Naw, but maybe a bit more close... I know what your thinkin', "Oh, again,here he goes!!" She said it every time... Her choice always Cheerios!!!!