_ is a unique origin i.e. zero.

A. Nominal scale
B. Ordinal scale
C. None of these
D. Ratio scale

🧠 Explanation:

A ratio scale has a unique origin of zero, enabling true ratio comparisons, like distance or temperature in Kelvin. For statistics or math students, understanding ratio scales highlights their role in precise measurements, making it a key topic for studying data analysis, statistical methods, and accurate data representation.