The answer is: [C]: "Niether Mike nor Marvin believed in Superman." _____________________________________________________________ The misspelled word is: "<em>Niether</em>" {sic} — which should be changed to the correct spelling — "<u><em>Neither</em></u>". _______________________________________________________________
Although the sentence with the misspelled word is c, because neither is misspelled, there is some capitalization era's in each sentence which could lead to misspelling as well.