The answer to the given question will be 'Octane Scale'.
- The first option i.e. 'a.Ordinal scale' is incorrect as it is used in statistics for measurement of data.
- The second option i.e. 'b.Nominal scale' is incorrect as it is used in statistics for measurement of data.
- The third option i.e. 'c.Ratio scale' is incorrect as it is used in statistics for measurement of data.
- The fourth option i.e. 'd.Interval scale' is incorrect as it is used in statistics for measurement of data.
- Thus, the correct answer will be 'Octane Scale'.
Note- The correct option is not provided in the question. This is a faulty question.