Which property is an indicator of a material's ability to rebound after being deformed?

Resilience is the property that indicates a material's ability to rebound or recover after being deformed. This characteristic is particularly important in materials subjected to dynamic loads or impacts, where they undergo elastic deformation. When a material is resilient, it can absorb energy when deformed and release that energy when it returns to its original shape, demonstrating its capacity to withstand stress without permanent deformation.

Hardness refers to a material’s resistance to localized deformation, usually measured by its indentation resistance, but it does not imply recovery from deformation. Toughness measures a material's ability to absorb energy and deform plastically without fracturing; however, it primarily focuses on energy absorption rather than the ability to rebound. Stiffness describes a material's resistance to deformation under load, determining how much it deforms when a certain force is applied, but it does not convey the ability to return to the original shape after the load is removed. Resilience specifically encompasses these rebound characteristics, making it the correct choice.