Why is potassium fluoride added to the electrolyte in the extraction of sodium from fused sodium chloride?

A. Pure sodium chloride does not conduct electricity
B. Potassium fluoride prevents the sodium produced from attacking the electrodes
C. Potassium fluoride increases conductivity
D. Potassium fluoride reduces the temperature at which sodium chloride fuses
E. the potassium fluoride acts as a catalyst

Correct Answer: Option D

D. Potassium fluoride reduces the temperature at which sodium chloride fuses