1 help please

Which aqueous solution will have the highest boiling point? a) Circle one: i) 0.045 m BaCl2 ii) 0.090 m KCI m iii) 0.150 m CHO b) Circle one: i) 1.00 m NaC,H,O, ii) 1.00 m CaBrz iii) 1.00 m CH20