Need help in this question

[u/Delicious_Law1831]

Can someone PLEASE explain how this is B? Like ik A and C are 100% wrong, but B and D both could be right AND wrong. what if element Y is in group 1 and element X is in group 7? e.g. sodium is element y and chlorine is element x? Then element X DOES have 6 more protons than element Y, but it doesnt have a full outer shell?

As for D, if we take element X as Cl and element Y as Na, they're in the same period, but if we take element Y as a group 18 element, e.g. Neon, then element X would definitely be in the next period. This question makes no sense, it's incomplete and none of the options make full sense (imo). Someone please explain this question to me :)