General chemistry question on molality, freezing point depression

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Tehonpx

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The question is attached, the correct answer is A, but I am unsure as to why. Please give as detailed an explanation as possible for the correct answer. Thanks!

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5. How would the freezing point depression of a 0.05 m CaCl, solution compare with that of a NaCl solution? It would be (A) less than that for a 0.10 m NaCl solution. (B) between that for a 0.10 m NaCl solution and a 0.20 m NaCl solution. (C) between that for a 0.20 m NaCl solution and a 0.30 m NaCl solution. (D) greater than that for a 0.30 m NaCl solution.
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