When the data are classified only on the basis of descriptive characteristics which cannot be quantified is known as

The correct answer is C. Qualitative classification.

Qualitative classification is a type of data classification that is based on descriptive characteristics that cannot be quantified. This type of classification is often used when the data is subjective or when there is no clear way to quantify the data. For example, qualitative classification could be used to classify data on the basis of color, shape, or texture.

A. Geographical classification is a type of data classification that is based on the location of the data. This type of classification is often used when the data is related to a specific location, such as a city, state, or country.

B. Chronological classification is a type of data classification that is based on the time of the data. This type of classification is often used when the data is related to a specific event or time period.

D. Quantitative classification is a type of data classification that is based on the quantity of the data. This type of classification is often used when the data is related to a specific measurement or value.