Which substance has the following properties?

•     Low melting point

•     Very soluble in water

•     Does not conduct electricity when molten

A.     Glucose, ${{\text{C}}_{\text{6}}}{{\text{H}}_{{\text{12}}}}{{\text{O}}_{\text{6}}}$

B.     Silicon dioxide, ${\text{Si}}{{\text{O}}_{\text{2}}}$

C.     Sodium chloride, NaCl

D.     Tetrachloromethane, ${\text{CC}}{{\text{l}}_{\text{4}}}$

A