Which of the following is the worst conductor of electricity?

Explanation

Pure distilled water is a poor conductor of electricity. Water itself is a good electrical insulator, but it can conduct electricity when it contains dissolved ions or impurities. These ions, such as sodium (Na+), chloride (Cl-), or other dissolved salts, increase the conductivity of water by allowing the flow of electric current. In order to conduct electricity, a substance must possess charged particles, either ions or electrons. Distilled water has neither of those as it does not dissociate into H+ or OH- ions unless it is dissolved with some other polar substance. Hence it does not conduct electricity and therefore option B is the correct answer.