Which of the following causes damage to car bodies, bridges, iron railings, ships and to all objects made of metals?

Corrosion

The correct answer is option 2. Corrosion.

The correct answer is Corrosion.

Corrosion is the process by which metals deteriorate due to various chemical reactions with their environment. It causes damage to car bodies, bridges, iron railings, ships, and all objects made of metals by gradually wearing away the metal surface, weakening structures, and compromising their integrity. Corrosion can occur due to exposure to moisture, oxygen, acids, salts, and other environmental factors, leading to rusting, pitting, tarnishing, and other forms of degradation.