All at once!

A bold choice, and one I respect. Of course, for something like this to happen to every X-Woman in Marvel, something drastic must of happened, whether this be a failed mission with every X-Woman in attendance, a full-on invasion of an organisation like HYDRA, A.I.M, etc, or the powers of a powerful reality-warper like Scarlet Witch or the Dark Phoenix, the choice is yours.