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antonsandiego

The correct answer is definitely D. CaCl2 
H2O can't be a productor just by itself as it need electrolytes.
CH3OH is non-polar one, so throw it.
You need something form ionic compound range, so the last one is the only suitable answer.

Erudite1

The correct option is D.

Substances that can conduct electricity in aqueous solutions are called electrolytes. Calcium chloride is an example of an electrolyte. Ionic compounds are usually good electrolytes, this is because they contain mobile ions, which can carry electricity round an electrical circuit. Both positive and negative ions are present in electrolytes; the positive ions comes from the metals while the negative ions comes from the non metals. These ions are able to move about when the compound is in the molten form or in aqueous solution.

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