The table compares some properties of four substances. Which substance might be potassium iodide?
- Amelting point of solid $-66\,^{\circ}\text{C}$; electrical conductivity when molten: poor
- Bmelting point of solid $-39\,^{\circ}\text{C}$; electrical conductivity when molten: good
- Cmelting point of solid $680\,^{\circ}\text{C}$; electrical conductivity when molten: good
- Dmelting point of solid $1600\,^{\circ}\text{C}$; electrical conductivity when molten: poor