Concept:Qualitative data is non-numerical and is recorded by observing categories or characteristics.
Explanation:Data is often divided into qualitative data and quantitative data.
Quantitative data deals with numbers and measurements.
Height, length, and shoe size can all be measured and expressed as numbers, so they are quantitative.
Qualitative data deals with qualities that cannot be counted or measured numerically.
Colour is a characteristic or category, such as red, blue, or green, so it is non-numerical.
It can be observed and recorded directly without any mathematical measurement.
Hence, colour is the clearest example of qualitative data among the given options.
Answer:A. Colour.