Answer:
The answer is: C) ratio
Step-by-step explanation:
A ratio variable has order and the difference between values is meaningful. Ratio variables include a clear definition of 0. For example, if you ask someone about the temperature, if he answers with "its 45°" it is a ratio variable, but if he says "it's cold" it would be an ordinal variable.
When customers are surveyed about their income level, they are giving a ratio variable, e.g. $100,000 per year. If they would answer "high income" then it would be an ordinal variable.