| Not clear what a class C license means. The USFA have number ratings for referees. The FIE uses a letter rating. If you have a class C, you can pretty much bet that you can referee any local and national (US anyway) event to the finals.
If you mean you have a competition rating of a C, well, that's nothing to do with refereeing. There are people who have C (or lower) competition rating and can referee quite well, and conversely.
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