Which statement best describes the properties of sodium chloride?
a.) sodium chloride is a malleable solid.
b.) solid sodium chloride is a good conductor of electric current.
c.) sodium chloride has a low melting point.
d.) liquid sodium chloride is a good conductor of electric current.

D. because sodium chloride is an ion

first of all , sodium chloride is salt and  we all know that it is not malleable.

sodium chloride is an ion which do conduct electricity but not when they are solidthey only do so when they are molten or aqueous ( dissolved in water )

sodium chloride is an ion. ions have high melting points.

D is true because as i have mentioned above , ions will conduct electricity when dissolved in water / aqueous or molten HOPE IT HELPED