What is meant by the term toughness as it applies to a material?

Correct Answer: Option B — The ability to resist repeated application and release of force.

Toughness represents a material's ability to absorb energy and deform plastically without fracturing under impact or repeated cyclic loading. This property is vital for marine machinery components subject to vibration, shock, and fatigue, ensuring they can withstand the repetitive forces inherent in shipboard propulsion and auxiliary systems.