The correct answer is B. Nominal scale.
A nominal scale is a scale of measurement that classifies data into categories. The categories are mutually exclusive and exhaustive, and there is no natural ordering of the categories. For example, gender is a nominal scale with two categories: male and female.
An ordinal scale is a scale of measurement that ranks data into categories. The categories are mutually exclusive and exhaustive, and the categories have a natural ordering. For example, a scale of customer satisfaction with five categories:
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