Following the failure of a river bridge, a new car was submerged in the river water for several months. After it was retrieved, the car parts made from steel, an alloy of iron, were found to have corroded. The parts made of aluminium had not corroded. Which statement accounts for these differences in corrosion?
- AAluminium has a coating of aluminium oxide.
- BAluminium has a very low density.
- CAluminium is an excellent conductor of electricity.
- DAluminium is less reactive than iron.