Correct option is B
Corrosion in reinforced concrete structures:
Premature reinforcement corrosion leads to the deterioration of concrete (or affects the durability of concrete).
The deterioration of concrete is a complex process influenced by several factors, such as the physical and chemical properties and the exposed condition of the concrete.
The main processes that cause the deterioration of concrete include carbonation and chlorination (ingress of chloride ions) which occurs due to the corrosion of reinforcement, and other causes are alkali-silica reaction (ASR), loss of oxygen, and cracking of concrete.
Hence, corrosion in reinforced concrete structures affects structural durability due to chlorination and carbonation.
