Wow. Interesting responses. A looks downright sick to me, and B is not far behind her... but that's my bias. Is B supposed to be the "ideal" shape that most men think is "perfect?"... (what is that photo, anyway?)
Personally, with ktsp's build being what it is (he's tall and thin), I'm very grateful for the meat and fat on my bones because otherwise, his pelvic bone would drill a hole in my thighs or ass every time I get pounded during sex. Cushion = good. I like having a body that can handle being fucked as hard as he can give it. If that means I'm a C, then bring it on!