The correct answer is A. Dilution.
The degree of dissociation of an electrolyte is the fraction of the total number of molecules that are dissociated into ions. It is a measure of how strongly the electrolyte is dissociated. The degree of dissociation increases with dilution. This is because the concentration of the electrolyte decreases as it is diluted, which makes it easier for the ions to separate from each other.
The other options are incorrect. Impurities do not affect the degree of dissociation of an electrolyte. Atmospheric pressure does not affect the degree of dissociation of an electrolyte. The method of dissolution does not affect the degree of dissociation of an electrolyte.
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