Which variable is least likely to be regarded as ratio data?

QUESTION
Which variable is least likely to be regarded as ratio data?

ANSWER
A.) Length of time required for a randomly chosen vehicle to cross a toll bridge (minutes)
B.) Weight of a randomly chosen student (pounds)
C.) Number of fatalities in a randomly chosen traffic disaster (persons)
D.) Student's evaluation of a professor's teaching (Likert scale)

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Whichvariableleast