Which One of the Following Is an Example of a Nominal

Multiple Choice

Which one of the following is an example of a nominal level of measurement?

A) reaction time of an adult male measured before and after drinking an ounce of alcohol
B) a high school senior's first, second, and third choice of colleges to attend
C) classification of psychiatric patients as either "neurotic" or "psychotic"
D) estimating the number of red blood cells in a laboratory sample