'The View': It's Whoopi Goldberg's crotch!
Think of the C-string as like ear muffs for the kooka, except instead of keeping one warm they are designed (most likely by a man) to allow women to forever shed the curse of panty lines (tag line: "Say hello to a sexy new bottom line").
Whoopi, looking puzzled, took one of the C-strings, pulled aside her voluminous ever-present robe and hooked the thing on over a pair of stretch pants. Luckily, an extreme close-up was captured on camera. The only way this could have been better is if Mario Cantone had suddenly reappeared to perform an encore of the Meow Mix theme song (he sang it earlier in the show).
(Apologies for the poor photo quality. Remarkably, ABC didn't post any C-string segment pictures to their press site, so we had to snap our TV.)