${?}_{{?}_{{?}_{?}}{?}_{{?}_{?}}{?}_{i}s\text{a}\text{d}\text{e}\text{f}\text{e}\text{n}\text{s}\text{e}\text{a}\text{v}\text{a}\text{i}\text{l}\text{a}\text{b}\text{l}\text{e}to\text{d}\text{e}\text{f}\text{e}\text{n}\text{d}\text{a}\text{n}\text{t}\text{s}\text{w}\text{h}\text{e}\text{r}\text{e}\text{a}\text{d}\text{e}\text{f}\text{e}\text{n}\text{d}\text{a}\text{n}\text{t}\text{m}\text{u}\text{s}\text{t}\text{p}\text{r}\text{o}\text{v}\text{e}\text{t}\text{h}\text{e}\text{p}\text{l}\text{a}\text{i}\text{n}\text{t}\text{i}\text{f}\text{f}\text{v}\text{o}\text{l}\text{u}\text{n}\text{t}\text{a}\text{r}\text{i}\text{l}\text{y}\text{u}\text{n}\text{d}\text{e}\text{r}\text{t}\text{o}\text{o}\text{k}\text{t}\text{h}\text{e}\text{r}\text{i}\text{s}\text{k}\text{t}\text{h}\text{e}\text{d}\text{e}\text{f}\text{e}\text{n}\text{d}\text{a}\text{n}\text{t}\text{c}\text{a}\text{u}\text{s}\text{e}\text{d}\text{.}}$

Multiple choice question.

Necessity

Strict liability

Assumption $of$ the risk

Contributory negligence