I think your answer is D. However I’m not 100% sure.
Answer: Boiling chips provide surfaces on which bubbles can form as the liquid boils.
Hope this helps!
<span>Colligative properties are dependent upon the number of molecules or ions present in solution. Therefore, 1 mole of Na2SO4 will produce 3 moles of ions and so it will have 3 times as much of an effect as 1 mole of sugar, which is not an electrolyte and can't dissociate to an appreciable extent.</span>