Which of the Following Is an Example of Nominal Type

Which of the following is an example of nominal type data?

A) Numbers applied to numeric variables for example, cholesterol result of 250 mg/dL
B) Numbers applied to nonnumeric variables for example blood types could be coded as group O=1, group A= 2 etc.
C) Numbers that are discrete and ordered for example, 4 = most severe injury, 2 = a moderately severe and 1 = a minor injury
D) Arithmetic mean