Shock absorber are usually made of steel because

Shock absorbers are usually made of steel because its elasticity is high; option [C]. High elasticity means that steel can deform under stress and return to its original shape without permanent deformation. This property is crucial for shock absorbers, which need to absorb and dissipate energy from impacts and vibrations repeatedly. Steel’s high elasticity ensures that it can handle these repeated stresses without breaking or losing its structural integrity. Additionally, steel is durable and has good tensile properties, meaning it can withstand significant forces without breaking. These characteristics make steel an ideal material for shock absorbers, ensuring they provide reliable performance and longevity in various applications, such as in vehicles and machinery. Therefore, the correct option is [C] Its elasticity is high, reflecting the essential property that makes steel suitable for this purpose.