In the past Ohio State has replaced grades. It's not something they always clearly state though so it's vulnerable to the whims of those directing the admissions decisions in any given year. You can call and ask, but be prepared to have to call again "just to make sure." I've personally been given conflicting information when communicating to different people at OSU about repeated courses. The best bet is to ask Sandra or another long-term admissions person about what they are doing this cycle.