hi
strength of oxyacids increase left to right and bottom to top
so Na<Al<S
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one question,
if it increases left to right, what about F2O? wouldn’t it be a weak acid because F is strong? what am i missing here 
but oxyacids can’t have metals?
Edit: the choices have Na and Al
that’s a great point, Al is amphoteric so it can still behave as an oxyacid
Na2O shouldn’t be an oxyacid, instead it acts as a base, so it will definitely have the least acidic/oxyacidic character out of the three options given
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