Originally Posted by lemondrops
. . . B would just start making the cake out of fear that otherwise someone else would do it and A would just leave.
. . . C would feel pressured into going, because hey, otherwise A will just leave . . .
what's wrong with someone leaving if that is what they want to do?
Another option is to invite C and D over to have cake with A and B. And C goes cycling alone and comes back. So many more options.