Which of the Following Will Never Be a Required Condition

Short Answer

Which of the following will never be a required condition of a non-parametric test? $\begin{array}{|l|l|}\hline A&\text {The data are ordinal. }\\\hline B&\text {The samples are drawn from unimodal and symmetrically distributed populations. }\\\hline C&\text {The data are interval. }\\\hline D&\text {The populations being compared are identical in spread and shape. }\\\hline \end{array}$