Which solution will have least vapour pressure?

Assuming each salt to be 80% dissociated , which of the following aqueous solution will have lowest vapour pressure ?

Which of the following solutions will have the lowest vapour pressure

Which of the aqueous equimolal solution will have its vapour pressure near to solvent ?

Which of the aqueous equimolal solution will have its vapour pressure near to solvent ?

Which of the following aqueous solutions will have maximum vapour pressure?

Water and ethanoul from non-ideal solution with positive deviation Raoult's law. This solution will have vapour pressure