Which is an example of a nominal scale data?

Which is an example of a nominal scale data?
A . a variable industry with categorical values such as financial, engineering, and retail
B . a variable mood with a scale of values unhappy, ok, and happy
C . a variable bank account balance whose possible values are $5, $10, and $15
D . a variable temperature with a scale of values low, medium, and high

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Answer: C