Which One of the Following Is an Example of a Ratio

Multiple Choice

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

A) the number of times a laboratory monkey presses a bar in its experimental chamber during a one-hour period
B) the temperature in Celsius of a hospital patient
C) a racing-car driver's position at the end of a race
D) a patient' rating of his own anxiety level on a scale where l0 represents "low anxiety" and l00 represents "extreme anxiety"