a. at the optic disc;   b. at the tip of the tongue;  c. at the fovea;   d. in the outer tunic of the eye;  e. in the middle ear
C. At the Fovea\nThe fovea is the centermost point in the macula, and responsible for our central, sharpest vision known as MACULA LUTEA
Yes, as has been stated previously the problem is there is a 0 where the O should be.  Most people would not noticed this because the mind is wired to find familiar patterns this one being the most basic of the basic to English speakers...the alphabet.  So, while you are going down the list reciting the alphabet you anticipate that an O will follow the N and thus "see" an O instead of a 0.  This seems to work the same way that a relevant brain study worked.  If an English speaker is shown a paragraph that has words misspelled but the switched letters are on the interior of the word, that isthe first and last letter are in the right place, the person's brain will read the word correctly without even noting the error.