
I think they want the reason for the C section, as the KC were under a lot of pressure from the Vet profession to not allow any litters registered after one C section.
As we know an emergency C section can be the result of a malpresentation etc, and a bitch then go on to whelp naturally in subsequent litters.
I would hope that after two Sections no-one would want to risk another litter from a bitch, but sadly I suppose people did or people interested in welfare aspects of breeding thought they did, with some breeds going for elective C sections more and more.