Step 1: Understanding measurement scales.
- Nominal scale: Categorizes data without numerical meaning (e.g., land cover types).
- Ordinal scale: Ranks data but does not define precise differences (e.g., low, medium, high).
- Interval scale: Defines equal intervals but lacks an absolute zero (e.g., temperature in Celsius).
- Ratio scale: Defines equal intervals and has an absolute zero (e.g., height, distance).
Step 2: Selecting the correct option.
Since ratio scales have an absolute zero, the correct answer is b. Ratio scale.